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PCRETEST(1) PCRETEST(1)	PCRETEST(1) General Commands Manual PCRETEST(1)



NAME	NAME
pcretest - a program for testing Perl-compatible regular expressions.	pcretest - a program for testing Perl-compatible regular expressions.


SYNOPSIS	SYNOPSIS

pcretest [options] [input file [output file]]	pcretest [options] [input file [output file]]
Line 14 SYNOPSIS	Line 14 SYNOPSIS
expressions. This document describes the features of the test program;	expressions. This document describes the features of the test program;
for details of the regular expressions themselves, see the pcrepattern	for details of the regular expressions themselves, see the pcrepattern
documentation. For details of the PCRE library function calls and their	documentation. For details of the PCRE library function calls and their
options, see the pcreapi documentation. The input for pcretest is a	options, see the pcreapi , pcre16 and pcre32 documentation.
sequence of regular expression patterns and strings to be matched, as
described below. The output shows the result of each match. Options on
the command line and the patterns control PCRE options and exactly what
is output.

	The input for pcretest is a sequence of regular expression patterns and
	strings to be matched, as described below. The output shows the result
	of each match. Options on the command line and the patterns control
	PCRE options and exactly what is output.

	As PCRE has evolved, it has acquired many different features, and as a
	result, pcretest now has rather a lot of obscure options for testing
	every possible feature. Some of these options are specifically designed
	for use in conjunction with the test script and data files that are
	distributed as part of PCRE, and are unlikely to be of use otherwise.
	They are all documented here, but without much justification.


	INPUT DATA FORMAT

	Input to pcretest is processed line by line, either by calling the C
	library's fgets() function, or via the libreadline library (see below).
	In Unix-like environments, fgets() treats any bytes other than newline
	as data characters. However, in some Windows environments character 26
	(hex 1A) causes an immediate end of file, and no further data is read.
	For maximum portability, therefore, it is safest to use only ASCII
	characters in pcretest input files.


	PCRE's 8-BIT, 16-BIT AND 32-BIT LIBRARIES

	From release 8.30, two separate PCRE libraries can be built. The origi-
	nal one supports 8-bit character strings, whereas the newer 16-bit
	library supports character strings encoded in 16-bit units. From
	release 8.32, a third library can be built, supporting character
	strings encoded in 32-bit units. The pcretest program can be used to
	test all three libraries. However, it is itself still an 8-bit program,
	reading 8-bit input and writing 8-bit output. When testing the 16-bit
	or 32-bit library, the patterns and data strings are converted to 16-
	or 32-bit format before being passed to the PCRE library functions.
	Results are converted to 8-bit for output.

	References to functions and structures of the form pcre[16\|32]_xx below
	mean "pcre_xx when using the 8-bit library, pcre16_xx when using the
	16-bit library, or pcre32_xx when using the 32-bit library".


COMMAND LINE OPTIONS	COMMAND LINE OPTIONS

	-8 If both the 8-bit library has been built, this option causes
	the 8-bit library to be used (which is the default); if the
	8-bit library has not been built, this option causes an
	error.

	-16 If both the 8-bit or the 32-bit, and the 16-bit libraries
	have been built, this option causes the 16-bit library to be
	used. If only the 16-bit library has been built, this is the
	default (so has no effect). If only the 8-bit or the 32-bit
	library has been built, this option causes an error.

	-32 If both the 8-bit or the 16-bit, and the 32-bit libraries
	have been built, this option causes the 32-bit library to be
	used. If only the 32-bit library has been built, this is the
	default (so has no effect). If only the 8-bit or the 16-bit
	library has been built, this option causes an error.

-b Behave as if each pattern has the /B (show byte code) modi-	-b Behave as if each pattern has the /B (show byte code) modi-
fier; the internal form is output after compilation.	fier; the internal form is output after compilation.

-C Output the version number of the PCRE library, and all avail-	-C Output the version number of the PCRE library, and all avail-
able information about the optional features that are	able information about the optional features that are
included, and then exit.	included, and then exit with zero exit code. All other
	options are ignored.

	-C option Output information about a specific build-time option, then
	exit. This functionality is intended for use in scripts such
	as RunTest. The following options output the value and set
	the exit code as indicated:

	ebcdic-nl the code for LF (= NL) in an EBCDIC environment:
	0x15 or 0x25
	0 if used in an ASCII environment
	exit code is always 0
	linksize the configured internal link size (2, 3, or 4)
	exit code is set to the link size
	newline the default newline setting:
	CR, LF, CRLF, ANYCRLF, or ANY
	exit code is always 0

	The following options output 1 for true or 0 for false, and
	set the exit code to the same value:

	ebcdic compiled for an EBCDIC environment
	jit just-in-time support is available
	pcre16 the 16-bit library was built
	pcre32 the 32-bit library was built
	pcre8 the 8-bit library was built
	ucp Unicode property support is available
	utf UTF-8 and/or UTF-16 and/or UTF-32 support
	is available

	If an unknown option is given, an error message is output;
	the exit code is 0.

-d Behave as if each pattern has the /D (debug) modifier; the	-d Behave as if each pattern has the /D (debug) modifier; the
internal form and information about the compiled pattern is	internal form and information about the compiled pattern is
output after compilation; -d is equivalent to -b -i.	output after compilation; -d is equivalent to -b -i.

-dfa Behave as if each data line contains the \D escape sequence;	-dfa Behave as if each data line contains the \D escape sequence;
this causes the alternative matching function,	this causes the alternative matching function,
pcre_dfa_exec(), to be used instead of the standard	pcre[16\|32]_dfa_exec(), to be used instead of the standard
pcre_exec() function (more detail is given below).	pcre[16\|32]_exec() function (more detail is given below).

-help Output a brief summary these options and then exit.	-help Output a brief summary these options and then exit.

Line 46 COMMAND LINE OPTIONS	Line 131 COMMAND LINE OPTIONS

-M Behave as if each data line contains the \M escape sequence;	-M Behave as if each data line contains the \M escape sequence;
this causes PCRE to discover the minimum MATCH_LIMIT and	this causes PCRE to discover the minimum MATCH_LIMIT and
MATCH_LIMIT_RECURSION settings by calling pcre_exec() repeat-	MATCH_LIMIT_RECURSION settings by calling pcre[16\|32]_exec()
edly with different limits.	repeatedly with different limits.

-m Output the size of each compiled pattern after it has been	-m Output the size of each compiled pattern after it has been
compiled. This is equivalent to adding /M to each regular	compiled. This is equivalent to adding /M to each regular
expression.	expression. The size is given in bytes for both libraries.

-o osize Set the number of elements in the output vector that is used	-o osize Set the number of elements in the output vector that is used
when calling pcre_exec() or pcre_dfa_exec() to be osize. The	when calling pcre[16\|32]_exec() or pcre[16\|32]_dfa_exec() to
default value is 45, which is enough for 14 capturing subex-	be osize. The default value is 45, which is enough for 14
pressions for pcre_exec() or 22 different matches for	capturing subexpressions for pcre[16\|32]_exec() or 22 differ-
pcre_dfa_exec(). The vector size can be changed for individ-	ent matches for pcre[16\|32]_dfa_exec(). The vector size can
ual matching calls by including \O in the data line (see	be changed for individual matching calls by including \O in
below).	the data line (see below).

-p Behave as if each pattern has the /P modifier; the POSIX	-p Behave as if each pattern has the /P modifier; the POSIX
wrapper API is used to call PCRE. None of the other options	wrapper API is used to call PCRE. None of the other options
has any effect when -p is set.	has any effect when -p is set. This option can be used only
	with the 8-bit library.

-q Do not output the version number of pcretest at the start of	-q Do not output the version number of pcretest at the start of
execution.	execution.

-S size On Unix-like systems, set the size of the run-time stack to	-S size On Unix-like systems, set the size of the run-time stack to
size megabytes.	size megabytes.

-s or -s+ Behave as if each pattern has the /S modifier; in other	-s or -s+ Behave as if each pattern has the /S modifier; in other
words, force each pattern to be studied. If -s+ is used, the	words, force each pattern to be studied. If -s+ is used, all
PCRE_STUDY_JIT_COMPILE flag is passed to pcre_study(), caus-	the JIT compile options are passed to pcre[16\|32]_study(),
ing just-in-time optimization to be set up if it is avail-	causing just-in-time optimization to be set up if it is
able. If the /I or /D option is present on a pattern	available, for both full and partial matching. Specific JIT
(requesting output about the compiled pattern), information	compile options can be selected by following -s+ with a digit
about the result of studying is not included when studying is	in the range 1 to 7, which selects the JIT compile modes as
caused only by -s and neither -i nor -d is present on the	follows:
command line. This behaviour means that the output from tests
that are run with and without -s should be identical, except
when options that output information about the actual running
of a match are set. The -M, -t, and -tm options, which give
information about resources used, are likely to produce dif-
ferent output with and without -s. Output may also differ if
the /C option is present on an individual pattern. This uses
callouts to trace the the matching process, and this may be
different between studied and non-studied patterns. If the
pattern contains (*MARK) items there may also be differences,
for the same reason. The -s command line option can be over-
ridden for specific patterns that should never be studied
(see the /S pattern modifier below).

-t Run each compile, study, and match many times with a timer,	1 normal match only
and output resulting time per compile or match (in millisec-	2 soft partial match only
onds). Do not set -m with -t, because you will then get the	3 normal match and soft partial match
size output a zillion times, and the timing will be dis-	4 hard partial match only
torted. You can control the number of iterations that are	6 soft and hard partial match
used for timing by following -t with a number (as a separate	7 all three modes (default)

	If -s++ is used instead of -s+ (with or without a following
	digit), the text "(JIT)" is added to the first output line
	after a match or no match when JIT-compiled code was actually
	used.

	Note that there are pattern options that can override -s,
	either specifying no studying at all, or suppressing JIT com-
	pilation.

	If the /I or /D option is present on a pattern (requesting
	output about the compiled pattern), information about the
	result of studying is not included when studying is caused
	only by -s and neither -i nor -d is present on the command
	line. This behaviour means that the output from tests that
	are run with and without -s should be identical, except when
	options that output information about the actual running of a
	match are set.

	The -M, -t, and -tm options, which give information about
	resources used, are likely to produce different output with
	and without -s. Output may also differ if the /C option is
	present on an individual pattern. This uses callouts to trace
	the the matching process, and this may be different between
	studied and non-studied patterns. If the pattern contains
	(*MARK) items there may also be differences, for the same
	reason. The -s command line option can be overridden for spe-
	cific patterns that should never be studied (see the /S pat-
	tern modifier below).

	-t Run each compile, study, and match many times with a timer,
	and output resulting time per compile or match (in millisec-
	onds). Do not set -m with -t, because you will then get the
	size output a zillion times, and the timing will be dis-
	torted. You can control the number of iterations that are
	used for timing by following -t with a number (as a separate
item on the command line). For example, "-t 1000" would iter-	item on the command line). For example, "-t 1000" would iter-
ate 1000 times. The default is to iterate 500000 times.	ate 1000 times. The default is to iterate 500000 times.

Line 108 COMMAND LINE OPTIONS	Line 217 COMMAND LINE OPTIONS

DESCRIPTION	DESCRIPTION

If pcretest is given two filename arguments, it reads from the first	If pcretest is given two filename arguments, it re If pcretest is given two filename arguments, it reads from the first
and writes to the second. If it is given only one filename argument, it	and writes to the second. If it is given only one filename argument, it
reads from that file and writes to stdout. Otherwise, it reads from	reads from that file and writes to stdout. Otherwise, it reads from
stdin and writes to stdout, and prompts for each line of input, using	stdin and writes to stdout, and prompts for each line of input, using
"re>" to prompt for regular expressions, and "data>" to prompt for data	"re>" to prompt for regular expressions, and "data>" to prompt for data
lines.	lines.

When pcretest is built, a configuration option can specify that it	When pcretest is built, a configuration option can specify that it
should be linked with the libreadline library. When this is done, if	should be linked with the libreadline library. When this is done, if
the input is from a terminal, it is read using the readline() function.	the input is from a terminal, it is read using the readline() function.
This provides line-editing and history facilities. The output from the	This provides line-editing and history facilities. The output from the
-help option states whether or not readline() will be used.	-help option states whether or not readline() will be used.

The program handles any number of sets of input on a single input file.	The program handles any number of sets of input on a single input file.
Each set starts with a regular expression, and continues with any num-	Each set starts with a regular expression, and continues with any num-
ber of data lines to be matched against the pattern.	ber of data lines to be matched against the pattern.

Each data line is matched separately and independently. If you want to	Each data line is matched separately and independently. If you want to
do multi-line matches, you have to use the \n escape sequence (or \r or	do multi-line matches, you have to use the \n escape sequence (or \r or
\r\n, etc., depending on the newline setting) in a single line of input	\r\n, etc., depending on the newline setting) in a single line of input
to encode the newline sequences. There is no limit on the length of	to encode the newline sequences. There is no limit on the length of
data lines; the input buffer is automatically extended if it is too	data lines; the input buffer is automatically extended if it is too
small.	small.

An empty line signals the end of the data lines, at which point a new	An empty line signals the end of the data lines, at which point a new
regular expression is read. The regular expressions are given enclosed	regular expression is read. The regular expressions are given enclosed
in any non-alphanumeric delimiters other than backslash, for example:	in any non-alphanumeric delimiters other than backslash, for example:

/(a\|bc)x+yz/	/(a\|bc)x+yz/

White space before the initial delimiter is ignored. A regular expres-	White space before the initial delimiter is ignored. A regular expres-
sion may be continued over several input lines, in which case the new-	sion may be continued over several input lines, in which case the new-
line characters are included within it. It is possible to include the	line characters are included within it. It is possible to include the
delimiter within the pattern by escaping it, for example	delimiter within the pattern by escaping it, for example

/abc\/def/	/abc\/def/

If you do so, the escape and the delimiter form part of the pattern,	If you do so, the escape and the delimiter form part of the pattern,
but since delimiters are always non-alphanumeric, this does not affect	but since delimiters are always non-alphanumeric, this does not affect
its interpretation. If the terminating delimiter is immediately fol-	its interpretation. If the terminating delimiter is immediately fol-
lowed by a backslash, for example,	lowed by a backslash, for example,

/abc/\	/abc/\

then a backslash is added to the end of the pattern. This is done to	then a backslash is added to the end of the pattern. This is done to
provide a way of testing the error condition that arises if a pattern	provide a way of testing the error condition that arises if a pattern
finishes with a backslash, because	finishes with a backslash, because

/abc\/	/abc\/

is interpreted as the first line of a pattern that starts with "abc/",	is interpreted as the first line of a pattern that starts with "abc/",
causing pcretest to read the next line as a continuation of the regular	causing pcretest to read the next line as a continuation of the regular
expression.	expression.


PATTERN MODIFIERS	PATTERN MODIFIERS

A pattern may be followed by any number of modifiers, which are mostly	A pattern may be followed by any number of modifiers, which are mostly
single characters. Following Perl usage, these are referred to below	single characters, though some of these can be qualified by further
as, for example, "the /i modifier", even though the delimiter of the	characters. Following Perl usage, these are referred to below as, for
pattern need not always be a slash, and no slash is used when writing	example, "the /i modifier", even though the delimiter of the pattern
modifiers. White space may appear between the final pattern delimiter	need not always be a slash, and no slash is used when writing modi-
and the first modifier, and between the modifiers themselves.	fiers. White space may appear between the final pattern delimiter and
	the first modifier, and between the modifiers themselves. For refer-
	ence, here is a complete list of modifiers. They fall into several
	groups that are described in detail in the following sections.

	/8 set UTF mode
	/9 set PCRE_NEVER_UTF (locks out UTF mode)
	/? disable UTF validity check
	/+ show remainder of subject after match
	/= show all captures (not just those that are set)

	/A set PCRE_ANCHORED
	/B show compiled code
	/C set PCRE_AUTO_CALLOUT
	/D same as /B plus /I
	/E set PCRE_DOLLAR_ENDONLY
	/F flip byte order in compiled pattern
	/f set PCRE_FIRSTLINE
	/G find all matches (shorten string)
	/g find all matches (use startoffset)
	/I show information about pattern
	/i set PCRE_CASELESS
	/J set PCRE_DUPNAMES
	/K show backtracking control names
	/L set locale
	/M show compiled memory size
	/m set PCRE_MULTILINE
	/N set PCRE_NO_AUTO_CAPTURE
	/P use the POSIX wrapper
	/S study the pattern after compilation
	/s set PCRE_DOTALL
	/T select character tables
	/U set PCRE_UNGREEDY
	/W set PCRE_UCP
	/X set PCRE_EXTRA
	/x set PCRE_EXTENDED
	/Y set PCRE_NO_START_OPTIMIZE
	/Z don't show lengths in /B output

	/<any> set PCRE_NEWLINE_ANY
	/<anycrlf> set PCRE_NEWLINE_ANYCRLF
	/<cr> set PCRE_NEWLINE_CR
	/<crlf> set PCRE_NEWLINE_CRLF
	/<lf> set PCRE_NEWLINE_LF
	/<bsr_anycrlf> set PCRE_BSR_ANYCRLF
	/<bsr_unicode> set PCRE_BSR_UNICODE
	/<JS> set PCRE_JAVASCRIPT_COMPAT


	Perl-compatible modifiers

The /i, /m, /s, and /x modifiers set the PCRE_CASELESS, PCRE_MULTILINE,	The /i, /m, /s, and /x modifiers set the PCRE_CASELESS, PCRE_MULTILINE,
PCRE_DOTALL, or PCRE_EXTENDED options, respectively, when pcre_com-	PCRE_DOTALL, or PCRE_EXTENDED options, respectively, when
pile() is called. These four modifier letters have the same effect as	pcre[16\|32]_compile() is called. These four modifier letters have the
they do in Perl. For example:	same effect as they do in Perl. For example:

/caseless/i	/caseless/i


	Modifiers for other PCRE options

The following table shows additional modifiers for setting PCRE com-	The following table shows additional modifiers for setting PCRE com-
pile-time options that do not correspond to anything in Perl:	pile-time options that do not correspond to anything in Perl:

/8 PCRE_UTF8	/8 PCRE_UTF8 ) when using the 8-bit
/? PCRE_NO_UTF8_CHECK	/? PCRE_NO_UTF8_CHECK ) library

	/8 PCRE_UTF16 ) when using the 16-bit
	/? PCRE_NO_UTF16_CHECK ) library

	/8 PCRE_UTF32 ) when using the 32-bit
	/? PCRE_NO_UTF32_CHECK ) library

	/9 PCRE_NEVER_UTF
/A PCRE_ANCHORED	/A PCRE_ANCHORED
/C PCRE_AUTO_CALLOUT	/C PCRE_AUTO_CALLOUT
/E PCRE_DOLLAR_ENDONLY	/E PCRE_DOLLAR_ENDONLY
Line 194 PATTERN MODIFIERS	Line 363 PATTERN MODIFIERS
/W PCRE_UCP	/W PCRE_UCP
/X PCRE_EXTRA	/X PCRE_EXTRA
/Y PCRE_NO_START_OPTIMIZE	/Y PCRE_NO_START_OPTIMIZE
/<JS> PCRE_JAVASCRIPT_COMPAT	/<any> PCRE_NEWLINE_ANY
	/<anycrlf> PCRE_NEWLINE_ANYCRLF
/<cr> PCRE_NEWLINE_CR	/<cr> PCRE_NEWLINE_CR
/<lf> PCRE_NEWLINE_LF
/<crlf> PCRE_NEWLINE_CRLF	/<crlf> PCRE_NEWLINE_CRLF
/<anycrlf> PCRE_NEWLINE_ANYCRLF	/<lf> PCRE_NEWLINE_LF
/<any> PCRE_NEWLINE_ANY
/<bsr_anycrlf> PCRE_BSR_ANYCRLF	/<bsr_anycrlf> PCRE_BSR_ANYCRLF
/<bsr_unicode> PCRE_BSR_UNICODE	/<bsr_unicode> PCRE_BSR_UNICODE
	/<JS> PCRE_JAVASCRIPT_COMPAT

The modifiers that are enclosed in angle brackets are literal strings	The modifiers that are enclosed in angle brackets are literal strings
as shown, including the angle brackets, but the letters within can be	as shown, including the angle brackets, but the letters within can be
Line 210 PATTERN MODIFIERS	Line 379 PATTERN MODIFIERS

/^abc/m<CRLF>	/^abc/m<CRLF>

As well as turning on the PCRE_UTF8 option, the /8 modifier also causes	As well as turning on the PCRE_UTF8/16/32 option, the /8 modifier
any non-printing characters in output strings to be printed using the	causes all non-printing characters in output strings to be printed
\x{hh...} notation if they are valid UTF-8 sequences. Full details of	using the \x{hh...} notation. Otherwise, those less than 0x100 are out-
the PCRE options are given in the pcreapi documentation.	put in hex without the curly brackets.

	Full details of the PCRE options are given in the pcreapi documenta-
	tion.

Finding all matches in a string	Finding all matches in a string

Searching for all possible matches within each subject string can be	Searching for all possible matches within each subject string can be
requested by the /g or /G modifier. After finding a match, PCRE is	requested by the /g or /G modifier. After finding a match, PCRE is
called again to search the remainder of the subject string. The differ-	called again to search the remainder of the subject string. The differ-
ence between /g and /G is that the former uses the startoffset argument	ence between /g and /G is that the former uses the startoffset argument
to pcre_exec() to start searching at a new point within the entire	to pcre[16\|32]_exec() to start searching at a new point within the
string (which is in effect what Perl does), whereas the latter passes	entire string (which is in effect what Perl does), whereas the latter
over a shortened substring. This makes a difference to the matching	passes over a shortened substring. This makes a difference to the
process if the pattern begins with a lookbehind assertion (including \b	matching process if the pattern begins with a lookbehind assertion
or \B).	(including \b or \B).

If any call to pcre_exec() in a /g or /G sequence matches an empty	If any call to pcre[16\|32]_exec() in a /g or /G sequence matches an
string, the next call is done with the PCRE_NOTEMPTY_ATSTART and	empty string, the next call is done with the PCRE_NOTEMPTY_ATSTART and
PCRE_ANCHORED flags set in order to search for another, non-empty,	PCRE_ANCHORED flags set in order to search for another, non-empty,
match at the same point. If this second match fails, the start offset	match at the same point. If this second match fails, the start offset
is advanced, and the normal match is retried. This imitates the way	is advanced, and the normal match is retried. This imitates the way
Perl handles such cases when using the /g modifier or the split() func-	Perl handles such cases when using the /g modifier or the split() func-
tion. Normally, the start offset is advanced by one character, but if	tion. Normally, the start offset is advanced by one character, but if
the newline convention recognizes CRLF as a newline, and the current	the newline convention recognizes CRLF as a newline, and the current
character is CR followed by LF, an advance of two is used.	character is CR followed by LF, an advance of two is used.

Other modifiers	Other modifiers

There are yet more modifiers for controlling the way pcretest operates.	There are yet more modifiers for controlling the way pcretest operates.

The /+ modifier requests that as well as outputting the substring that	The /+ modifier requests that as well as outputting the substring that
matched the entire pattern, pcretest should in addition output the	matched the entire pattern, pcretest should in addition output the
remainder of the subject string. This is useful for tests where the	remainder of the subject string. This is useful for tests where the
subject contains multiple copies of the same substring. If the + modi-	subject contains multiple copies of the same substring. If the + modi-
fier appears twice, the same action is taken for captured substrings.	fier appears twice, the same action is taken for captured substrings.
In each case the remainder is output on the following line with a plus	In each case the remainder is output on the following line with a plus
character following the capture number. Note that this modifier must	character following the capture number. Note that this modifier must
not immediately follow the /S modifier because /S+ has another meaning.	not immediately follow the /S modifier because /S+ and /S++ have other
	meanings.

The /= modifier requests that the values of all potential captured	The /= modifier requests that the values of all potential captured
parentheses be output after a match by pcre_exec(). By default, only	parentheses be output after a match. By default, only those up to the
those up to the highest one actually used in the match are output (cor-	highest one actually used in the match are output (corresponding to the
responding to the return code from pcre_exec()). Values in the offsets	return code from pcre[16\|32]_exec()). Values in the offsets vector cor-
vector corresponding to higher numbers should be set to -1, and these	responding to higher numbers should be set to -1, and these are output
are output as "<unset>". This modifier gives a way of checking that	as "<unset>". This modifier gives a way of checking that this is hap-
this is happening.	pening.

The /B modifier is a debugging feature. It requests that pcretest out-	The /B modifier is a debugging feature. It requests that pcretest out-
put a representation of the compiled byte code after compilation. Nor-	put a representation of the compiled code after compilation. Normally
mally this information contains length and offset values; however, if	this information contains length and offset values; however, if /Z is
/Z is also present, this data is replaced by spaces. This is a special	also present, this data is replaced by spaces. This is a special fea-
feature for use in the automatic test scripts; it ensures that the same	ture for use in the automatic test scripts; it ensures that the same
output is generated for different internal link sizes.	output is generated for different internal link sizes.

The /D modifier is a PCRE debugging feature, and is equivalent to /BI,	The /D modifier is a PCRE debugging feature, and is equivalent to /BI,
that is, both the /B and the /I modifiers.	that is, both the /B and the /I modifiers.

The /F modifier causes pcretest to flip the byte order of the fields in	The /F modifier causes pcretest to flip the byte order of the 2-byte
the compiled pattern that contain 2-byte and 4-byte numbers. This	and 4-byte fields in the compiled pattern. This facility is for testing
facility is for testing the feature in PCRE that allows it to execute	the feature in PCRE that allows it to execute patterns that were com-
patterns that were compiled on a host with a different endianness. This	piled on a host with a different endianness. This feature is not avail-
feature is not available when the POSIX interface to PCRE is being	able when the POSIX interface to PCRE is being used, that is, when the
used, that is, when the /P pattern modifier is specified. See also the	/P pattern modifier is specified. See also the section about saving and
section about saving and reloading compiled patterns below.	reloading compiled patterns below.

The /I modifier requests that pcretest output information about the	The /I modifier requests that pcretest output information about the
compiled pattern (whether it is anchored, has a fixed first character,	compiled pattern (whether it is anchored, has a fixed first character,
and so on). It does this by calling pcre_fullinfo() after compiling a	and so on). It does this by calling pcre[16\|32]_fullinfo() after com-
pattern. If the pattern is studied, the results of that are also out-	piling a pattern. If the pattern is studied, the results of that are
put.	also output.

The /K modifier requests pcretest to show names from backtracking con-	The /K modifier requests pcretest to show names from backtracking con-
trol verbs that are returned from calls to pcre_exec(). It causes	trol verbs that are returned from calls to pcre[16\|32]_exec(). It
pcretest to create a pcre_extra block if one has not already been cre-	causes pcretest to create a pcre[16\|32]_extra block if one has not
ated by a call to pcre_study(), and to set the PCRE_EXTRA_MARK flag and	already been created by a call to pcre[16\|32]_study(), and to set the
the mark field within it, every time that pcre_exec() is called. If the	PCRE_EXTRA_MARK flag and the mark field within it, every time that
variable that the mark field points to is non-NULL for a match, non-	pcre[16\|32]_exec() is called. If the variable that the mark field
match, or partial match, pcretest prints the string to which it points.	points to is non-NULL for a match, non-match, or partial match,
For a match, this is shown on a line by itself, tagged with "MK:". For	pcretest prints the string to which it points. For a match, this is
a non-match it is added to the message.	shown on a line by itself, tagged with "MK:". For a non-match it is
	added to the message.

The /L modifier must be followed directly by the name of a locale, for	The /L modifier must be followed directly by the name of a locale, for
example,	example,

/pattern/Lfr_FR	/pattern/Lfr_FR

For this reason, it must be the last modifier. The given locale is set,	For this reason, it must be the last modifier. The given locale is set,
pcre_maketables() is called to build a set of character tables for the	pcre[16\|32]_maketables() is called to build a set of character tables
locale, and this is then passed to pcre_compile() when compiling the	for the locale, and this is then passed to pcre[16\|32]_compile() when
regular expression. Without an /L (or /T) modifier, NULL is passed as	compiling the regular expression. Without an /L (or /T) modifier, NULL
the tables pointer; that is, /L applies only to the expression on which	is passed as the tables pointer; that is, /L applies only to the
it appears.	expression on which it appears.

The /M modifier causes the size of memory block used to hold the com-	The /M modifier causes the size in bytes of the memory block used to
piled pattern to be output. This does not include the size of the pcre	hold the compiled pattern to be output. This does not include the size
block; it is just the actual compiled data. If the pattern is success-	of the pcre[16\|32] block; it is just the actual compiled data. If the
fully studied with the PCRE_STUDY_JIT_COMPILE option, the size of the	pattern is successfully studied with the PCRE_STUDY_JIT_COMPILE option,
JIT compiled code is also output.	the size of the JIT compiled code is also output.

If the /S modifier appears once, it causes pcre_study() to be called	The /S modifier causes pcre[16\|32]_study() to be called after the
after the expression has been compiled, and the results used when the	expression has been compiled, and the results used when the expression
expression is matched. If /S appears twice, it suppresses studying,	is matched. There are a number of qualifying characters that may follow
even if it was requested externally by the -s command line option. This	makes it possible to specify that certain patterns are always studied,

	If S is followed by an exclamation mark, pcre[16\|32]_study() is called
	with the PCRE_STUDY_EXTRA_NEEDED option, causing it always to return a
	pcre_extra block, even when studying discovers no useful information.

	If /S is followed by a second S character, it suppresses studying, even
	if it was requested externally by the -s command line option. This
makes it possible to specify that certain patterns are always studied,	makes it possible to specify that certain patterns are always studied,
and others are never studied, independently of -s. This feature is used	and others are never studied, independently of -s. This feature is used
in the test files in a few cases where the output is different when the	in the test files in a few cases where the output is different when the
pattern is studied.	pattern is studied.

If the /S modifier is immediately followed by a + character, the call	If the /S modifier is followed by a + character, the call to
to pcre_study() is made with the PCRE_STUDY_JIT_COMPILE option,	pcre[16\|32]_study() is made with all the JIT study options, requesting
requesting just-in-time optimization support if it is available. Note	just-in-time optimization support if it is available, for both normal
that there is also a /+ modifier; it must not be given immediately	and partial matching. If you want to restrict the JIT compiling modes,
after /S because this will be misinterpreted. If JIT studying is suc-	you can follow /S+ with a digit in the range 1 to 7:
cessful, it will automatically be used when pcre_exec() is run, except
when incompatible run-time options are specified. These include the
partial matching options; a complete list is given in the pcrejit docu-
mentation. See also the \J escape sequence below for a way of setting
the size of the JIT stack.

The /T modifier must be followed by a single digit. It causes a spe-	1 normal match only
cific set of built-in character tables to be passed to pcre_compile().	2 soft partial match only
It is used in the standard PCRE tests to check behaviour with different	3 normal match and soft partial match
character tables. The digit specifies the tables as follows:	4 hard partial match only
	6 soft and hard partial match
	7 all three modes (default)

	If /S++ is used instead of /S+ (with or without a following digit), the
	text "(JIT)" is added to the first output line after a match or no
	match when JIT-compiled code was actually used.

	Note that there is also an independent /+ modifier; it must not be
	given immediately after /S or /S+ because this will be misinterpreted.

	If JIT studying is successful, the compiled JIT code will automatically
	be used when pcre[16\|32]_exec() is run, except when incompatible run-
	time options are specified. For more details, see the pcrejit documen-
	tation. See also the \J escape sequence below for a way of setting the
	size of the JIT stack.

	Finally, if /S is followed by a minus character, JIT compilation is
	suppressed, even if it was requested externally by the -s command line
	option. This makes it possible to specify that JIT is never to be used
	for certain patterns.

	The /T modifier must be followed by a single digit. It causes a spe-
	cific set of built-in character tables to be passed to pcre[16\|32]_com-
	pile(). It is used in the standard PCRE tests to check behaviour with
	different character tables. The digit specifies the tables as follows:

0 the default ASCII tables, as distributed in	0 the default ASCII tables, as distributed in
pcre_chartables.c.dist	pcre_chartables.c.dist
1 a set of tables defining ISO 8859 characters	1 a set of tables defining ISO 8859 characters

In table 1, some characters whose codes are greater than 128 are iden-	In table 1, some characters whose codes are greater than 128 are iden-
tified as letters, digits, spaces, etc.	tified as letters, digits, spaces, etc.

Using the POSIX wrapper API	Using the POSIX wrapper API

The /P modifier causes pcretest to call PCRE via the POSIX wrapper API	The /P modifier causes pcretest to call PCRE via the POSIX wrapper API
rather than its native API. When /P is set, the following modifiers set	rather than its native API. This supports only the 8-bit library. When
options for the regcomp() function:	/P is set, the following modifiers set options for the regcomp() func-
	tion:

/i REG_ICASE	/i REG_ICASE
/m REG_NEWLINE	/m REG_NEWLINE
Line 362 PATTERN MODIFIERS	Line 564 PATTERN MODIFIERS

DATA LINES	DATA LINES

Before each data line is passed to pcre_exec(), leading and trailing	Before each data line is passed to pcre[16\|32]_exec(), leading and
white space is removed, and it is then scanned for \ escapes. Some of	trailing white space is removed, and it is then scanned for \ escapes.
these are pretty esoteric features, intended for checking out some of	Some of these are pretty esoteric features, intended for checking out
the more complicated features of PCRE. If you are just testing "ordi-	some of the more complicated features of PCRE. If you are just testing
nary" regular expressions, you probably don't need any of these. The	"ordinary" regular expressions, you probably don't need any of these.
following escapes are recognized:	The following escapes are recognized:

\a alarm (BEL, \x07)	\a alarm (BEL, \x07)
\b backspace (\x08)	\b backspace (\x08)
Line 379 DATA LINES	Line 581 DATA LINES
\r carriage return (\x0d)	\r carriage return (\x0d)
\t tab (\x09)	\t tab (\x09)
\v vertical tab (\x0b)	\v vertical tab (\x0b)
\nnn octal character (up to 3 octal digits)	\nnn octal character (up to 3 octal digits); always
always a byte unless > 255 in UTF-8 mode	a byte unless > 255 in UTF-8 or 16-bit or 32-bit mode
\xhh hexadecimal byte (up to 2 hex digits)	\xhh hexadecimal byte (up to 2 hex digits)
\x{hh...} hexadecimal character, any number of digits	\x{hh...} hexadecimal character (any number of hex digits)
in UTF-8 mode	\A pass the PCRE_ANCHORED option to pcre[16\|32]_exec()
\A pass the PCRE_ANCHORED option to pcre_exec()	or pcre[16\|32]_dfa_exec()
or pcre_dfa_exec()	\B pass the PCRE_NOTBOL option to pcre[16\|32]_exec()
\B pass the PCRE_NOTBOL option to pcre_exec()	or pcre[16\|32]_dfa_exec()
or pcre_dfa_exec()	\Cdd call pcre[16\|32]_copy_substring() for substring dd
\Cdd call pcre_copy_substring() for substring dd
after a successful match (number less than 32)	after a successful match (number less than 32)
\Cname call pcre_copy_named_substring() for substring	\Cname call pcre[16\|32]_copy_named_substring() for substring
"name" after a successful match (name termin-	"name" after a successful match (name termin-
ated by next non alphanumeric character)	ated by next non alphanumeric character)
\C+ show the current captured substrings at callout	\C+ show the current captured substrings at callout
Line 402 DATA LINES	Line 603 DATA LINES
reached for the nth time	reached for the nth time
\C*n pass the number n (may be negative) as callout	\C*n pass the number n (may be negative) as callout
data; this is used as the callout return value	data; this is used as the callout return value
\D use the pcre_dfa_exec() match function	\D use the pcre[16\|32]_dfa_exec() match function
\F only shortest match for pcre_dfa_exec()	\F only shortest match for pcre[16\|32]_dfa_exec()
\Gdd call pcre_get_substring() for substring dd	\Gdd call pcre[16\|32]_get_substring() for substring dd
after a successful match (number less than 32)	after a successful match (number less than 32)
\Gname call pcre_get_named_substring() for substring	\Gname call pcre[16\|32]_get_named_substring() for substring
"name" after a successful match (name termin-	"name" after a successful match (name termin-
ated by next non-alphanumeric character)	ated by next non-alphanumeric character)
\Jdd set up a JIT stack of dd kilobytes maximum (any	\Jdd set up a JIT stack of dd kilobytes maximum (any
number of digits)	number of digits)
\L call pcre_get_substringlist() after a	\L call pcre[16\|32]_get_substringlist() after a
successful match	successful match
\M discover the minimum MATCH_LIMIT and	\M discover the minimum MATCH_LIMIT and
MATCH_LIMIT_RECURSION settings	MATCH_LIMIT_RECURSION settings
\N pass the PCRE_NOTEMPTY option to pcre_exec()	\N pass the PCRE_NOTEMPTY option to pcre[16\|32]_exec()
or pcre_dfa_exec(); if used twice, pass the	or pcre[16\|32]_dfa_exec(); if used twice, pass the
PCRE_NOTEMPTY_ATSTART option	PCRE_NOTEMPTY_ATSTART option
\Odd set the size of the output vector passed to	\Odd set the size of the output vector passed to
pcre_exec() to dd (any number of digits)	pcre[16\|32]_exec() to dd (any number of digits)
\P pass the PCRE_PARTIAL_SOFT option to pcre_exec()	\P pass the PCRE_PARTIAL_SOFT option to pcre[16\|32]_exec()
or pcre_dfa_exec(); if used twice, pass the	or pcre[16\|32]_dfa_exec(); if used twice, pass the
PCRE_PARTIAL_HARD option	PCRE_PARTIAL_HARD option
\Qdd set the PCRE_MATCH_LIMIT_RECURSION limit to dd	\Qdd set the PCRE_MATCH_LIMIT_RECURSION limit to dd
(any number of digits)	(any number of digits)
\R pass the PCRE_DFA_RESTART option to pcre_dfa_exec()	\R pass the PCRE_DFA_RESTART option to pcre[16\|32]_dfa_exec()
\S output details of memory get/free calls during matching	\S output details of memory get/free calls during matching
\Y pass the PCRE_NO_START_OPTIMIZE option to pcre_exec()	\Y pass the PCRE_NO_START_OPTIMIZE option to
or pcre_dfa_exec()	pcre[16\|32]_exec()
\Z pass the PCRE_NOTEOL option to pcre_exec()	or pcre[16\|32]_dfa_exec()
or pcre_dfa_exec()	\Z pass the PCRE_NOTEOL option to pcre[16\|32]_exec()
\? pass the PCRE_NO_UTF8_CHECK option to	or pcre[16\|32]_dfa_exec()
pcre_exec() or pcre_dfa_exec()	\? pass the PCRE_NO_UTF[8\|16\|32]_CHECK option to
	pcre[16\|32]_exec() or pcre[16\|32]_dfa_exec()
\>dd start the match at offset dd (optional "-"; then	\>dd start the match at offset dd (optional "-"; then
any number of digits); this sets the startoffset	any number of digits); this sets the startoffset
argument for pcre_exec() or pcre_dfa_exec()	argument for pcre[16\|32]_exec() or
\<cr> pass the PCRE_NEWLINE_CR option to pcre_exec()	pcre[16\|32]_dfa_exec()
or pcre_dfa_exec()	\<cr> pass the PCRE_NEWLINE_CR option to pcre[16\|32]_exec()
\<lf> pass the PCRE_NEWLINE_LF option to pcre_exec()	or pcre[16\|32]_dfa_exec()
or pcre_dfa_exec()	\<lf> pass the PCRE_NEWLINE_LF option to pcre[16\|32]_exec()
\<crlf> pass the PCRE_NEWLINE_CRLF option to pcre_exec()	or pcre[16\|32]_dfa_exec()
or pcre_dfa_exec()	\<crlf> pass the PCRE_NEWLINE_CRLF option to pcre[16\|32]_exec()
\<anycrlf> pass the PCRE_NEWLINE_ANYCRLF option to pcre_exec()	or pcre[16\|32]_dfa_exec()
or pcre_dfa_exec()	\<anycrlf> pass the PCRE_NEWLINE_ANYCRLF option to pcre[16\|32]_exec()
\<any> pass the PCRE_NEWLINE_ANY option to pcre_exec()	or pcre[16\|32]_dfa_exec()
or pcre_dfa_exec()	\<any> pass the PCRE_NEWLINE_ANY option to pcre[16\|32]_exec()
	or pcre[16\|32]_dfa_exec()

Note that \xhh always specifies one byte, even in UTF-8 mode; this	The use of \x{hh...} is not dependent on the use of the /8 modifier on
makes it possible to construct invalid UTF-8 sequences for testing pur-	the pattern. It is recognized always. There may be any number of hexa-
poses. On the other hand, \x{hh} is interpreted as a UTF-8 character in	decimal digits inside the braces; invalid values provoke error mes-
UTF-8 mode, generating more than one byte if the value is greater than	sages.
127. When not in UTF-8 mode, it generates one byte for values less than
256, and causes an error for greater values.

The escapes that specify line ending sequences are literal strings,	Note that \xhh specifies one byte rather than one character in UTF-8
	mode; this makes it possible to construct invalid UTF-8 sequences for
	testing purposes. On the other hand, \x{hh} is interpreted as a UTF-8
	character in UTF-8 mode, generating more than one byte if the value is
	greater than 127. When testing the 8-bit library not in UTF-8 mode,
	\x{hh} generates one byte for values less than 256, and causes an error
	for greater values.

	In UTF-16 mode, all 4-digit \x{hhhh} values are accepted. This makes it
	possible to construct invalid UTF-16 sequences for testing purposes.

	In UTF-32 mode, all 4- to 8-digit \x{...} values are accepted. This
	makes it possible to construct invalid UTF-32 sequences for testing
	purposes.

	The escapes that specify line ending sequences are literal strings,
exactly as shown. No more than one newline setting should be present in	exactly as shown. No more than one newline setting should be present in
any data line.	any data line.

A backslash followed by anything else just escapes the anything else.	A backslash followed by anything else just escapes the anything else.
If the very last character is a backslash, it is ignored. This gives a	If the very last character is a backslash, it is ignored. This gives a
way of passing an empty line as data, since a real empty line termi-	way of passing an empty line as data, since a real empty line termi-
nates the data input.	nates the data input.

The \J escape provides a way of setting the maximum stack size that is	The \J escape provides a way of setting the maximum stack size that is
used by the just-in-time optimization code. It is ignored if JIT opti-	used by the just-in-time optimization code. It is ignored if JIT opti-
mization is not being used. Providing a stack that is larger than the	mization is not being used. Providing a stack that is larger than the
default 32K is necessary only for very complicated patterns.	default 32K is necessary only for very complicated patterns.

If \M is present, pcretest calls pcre_exec() several times, with dif-	If \M is present, pcretest calls pcre[16\|32]_exec() several times, with
ferent values in the match_limit and match_limit_recursion fields of	different values in the match_limit and match_limit_recursion fields of
the pcre_extra data structure, until it finds the minimum numbers for	the pcre[16\|32]_extra data structure, until it finds the minimum num-
each parameter that allow pcre_exec() to complete without error.	bers for each parameter that allow pcre[16\|32]_exec() to complete with-
Because this is testing a specific feature of the normal interpretive	out error. Because this is testing a specific feature of the normal
pcre_exec() execution, the use of any JIT optimization that might have	interpretive pcre[16\|32]_exec() execution, the use of any JIT optimiza-
been set up by the /S+ qualifier of -s+ option is disabled.	tion that might have been set up by the /S+ qualifier of -s+ option is
	disabled.

The match_limit number is a measure of the amount of backtracking that	The match_limit number is a measure of the amount of backtracking that
takes place, and checking it out can be instructive. For most simple	takes place, and checking it out can be instructive. For most simple
Line 487 DATA LINES	Line 704 DATA LINES

When \O is used, the value specified may be higher or lower than the	When \O is used, the value specified may be higher or lower than the
size set by the -O command line option (or defaulted to 45); \O applies	size set by the -O command line option (or defaulted to 45); \O applies
only to the call of pcre_exec() for the line in which it appears.	only to the call of pcre[16\|32]_exec() for the line in which it
	appears.

If the /P modifier was present on the pattern, causing the POSIX wrap-	If the /P modifier was present on the pattern, causing the POSIX wrap-
per API to be used, the only option-setting sequences that have any	per API to be used, the only option-setting sequences that have any
effect are \B, \N, and \Z, causing REG_NOTBOL, REG_NOTEMPTY, and	effect are \B, \N, and \Z, causing REG_NOTBOL, REG_NOTEMPTY, and
REG_NOTEOL, respectively, to be passed to regexec().	REG_NOTEOL, respectively, to be passed to regexec().

The use of \x{hh...} to represent UTF-8 characters is not dependent on
the use of the /8 modifier on the pattern. It is recognized always.
There may be any number of hexadecimal digits inside the braces. The
result is from one to six bytes, encoded according to the original
UTF-8 rules of RFC 2279. This allows for values in the range 0 to
0x7FFFFFFF. Note that not all of those are valid Unicode code points,
or indeed valid UTF-8 characters according to the later rules in RFC
3629.


THE ALTERNATIVE MATCHING FUNCTION	THE ALTERNATIVE MATCHING FUNCTION

By default, pcretest uses the standard PCRE matching function,	By default, pcretest uses the standard PCRE matching function,
pcre_exec() to match each data line. From release 6.0, PCRE supports an	pcre[16\|32]_exec() to match each data line. PCRE also supports an
alternative matching function, pcre_dfa_test(), which operates in a	alternative matching function, pcre[16\|32]_dfa_test(), which operates
different way, and has some restrictions. The differences between the	in a different way, and has some restrictions. The differences between
two functions are described in the pcrematching documentation.	the two functions are described in the pcrematching documentation.

If a data line contains the \D escape sequence, or if the command line	If a data line contains the \D escape sequence, or if the command line
contains the -dfa option, the alternative matching function is called.	contains the -dfa option, the alternative matching function is used.
This function finds all possible matches at a given point. If, however,	This function finds all possible matches at a given point. If, however,
the \F escape sequence is present in the data line, it stops after the	the \F escape sequence is present in the data line, it stops after the
first match is found. This is always the shortest possible match.	first match is found. This is always the shortest possible match.
Line 522 THE ALTERNATIVE MATCHING FUNCTION	Line 731 THE ALTERNATIVE MATCHING FUNCTION
DEFAULT OUTPUT FROM PCRETEST	DEFAULT OUTPUT FROM PCRETEST

This section describes the output when the normal matching function,	This section describes the output when the normal matching function,
pcre_exec(), is being used.	pcre[16\|32]_exec(), is being used.

When a match succeeds, pcretest outputs the list of captured substrings	When a match succeeds, pcretest outputs the list of captured substrings
that pcre_exec() returns, starting with number 0 for the string that	that pcre[16\|32]_exec() returns, starting with number 0 for the string
matched the whole pattern. Otherwise, it outputs "No match" when the	that matched the whole pattern. Otherwise, it outputs "No match" when
return is PCRE_ERROR_NOMATCH, and "Partial match:" followed by the par-	the return is PCRE_ERROR_NOMATCH, and "Partial match:" followed by the
tially matching substring when pcre_exec() returns PCRE_ERROR_PARTIAL.	partially matching substring when pcre[16\|32]_exec() returns
(Note that this is the entire substring that was inspected during the	PCRE_ERROR_PARTIAL. (Note that this is the entire substring that was
partial match; it may include characters before the actual match start	inspected during the partial match; it may include characters before
if a lookbehind assertion, \K, \b, or \B was involved.) For any other	the actual match start if a lookbehind assertion, \K, \b, or \B was
return, pcretest outputs the PCRE negative error number and a short	involved.) For any other return, pcretest outputs the PCRE negative
descriptive phrase. If the error is a failed UTF-8 string check, the	error number and a short descriptive phrase. If the error is a failed
byte offset of the start of the failing character and the reason code	UTF string check, the offset of the start of the failing character and
are also output, provided that the size of the output vector is at	the reason code are also output, provided that the size of the output
least two. Here is an example of an interactive pcretest run.	vector is at least two. Here is an example of an interactive pcretest
	run.

$ pcretest	$ pcretest
PCRE version 8.13 2011-04-30	PCRE version 8.13 2011-04-30
Line 549 DEFAULT OUTPUT FROM PCRETEST	Line 759 DEFAULT OUTPUT FROM PCRETEST
No match	No match

Unset capturing substrings that are not followed by one that is set are	Unset capturing substrings that are not followed by one that is set are
not returned by pcre_exec(), and are not shown by pcretest. In the fol-	not returned by pcre[16\|32]_exec(), and are not shown by pcretest. In
lowing example, there are two capturing substrings, but when the first	the following example, there are two capturing substrings, but when the
data line is matched, the second, unset substring is not shown. An	first data line is matched, the second, unset substring is not shown.
"internal" unset substring is shown as "<unset>", as for the second	An "internal" unset substring is shown as "<unset>", as for the second
data line.	data line.

re> /(a)\|(b)/	re> /(a)\|(b)/
Line 564 DEFAULT OUTPUT FROM PCRETEST	Line 774 DEFAULT OUTPUT FROM PCRETEST
1: <unset>	1: <unset>
2: b	2: b

If the strings contain any non-printing characters, they are output as	If the strings contain any non-printing characters, they are output as
\0x escapes, or as \x{...} escapes if the /8 modifier was present on	\xhh escapes if the value is less than 256 and UTF mode is not set.
the pattern. See below for the definition of non-printing characters.	Otherwise they are output as \x{hh...} escapes. See below for the defi-
If the pattern has the /+ modifier, the output for substring 0 is fol-	nition of non-printing characters. If the pattern has the /+ modifier,
lowed by the the rest of the subject string, identified by "0+" like	the output for substring 0 is followed by the the rest of the subject
this:	string, identified by "0+" like this:

re> /cat/+	re> /cat/+
data> cataract	data> cataract
0: cat	0: cat
0+ aract	0+ aract

If the pattern has the /g or /G modifier, the results of successive	If the pattern has the /g or /G modifier, the results of successive
matching attempts are output in sequence, like this:	matching attempts are output in sequence, like this:

re> /\Bi(\w\w)/g	re> /\Bi(\w\w)/g
Line 588 DEFAULT OUTPUT FROM PCRETEST	Line 798 DEFAULT OUTPUT FROM PCRETEST
0: ipp	0: ipp
1: pp	1: pp

"No match" is output only if the first match attempt fails. Here is an	"No match" is output only if the first match attempt fails. Here is an
example of a failure message (the offset 4 that is specified by \>4 is	example of a failure message (the offset 4 that is specified by \>4 is
past the end of the subject string):	past the end of the subject string):

re> /xyz/	re> /xyz/
data> xyz\>4	data> xyz\>4
Error -24 (bad offset value)	Error -24 (bad offset value)

If any of the sequences \C, \G, or \L are present in a data line that	If any of the sequences \C, \G, or \L are present in a data line that
is successfully matched, the substrings extracted by the convenience	is successfully matched, the substrings extracted by the convenience
functions are output with C, G, or L after the string number instead of	functions are output with C, G, or L after the string number instead of
a colon. This is in addition to the normal full list. The string length	a colon. This is in addition to the normal full list. The string length
(that is, the return from the extraction function) is given in paren-	(that is, the return from the extraction function) is given in paren-
theses after each string for \C and \G.	theses after each string for \C and \G.

Note that whereas patterns can be continued over several lines (a plain	Note that whereas patterns can be continued over several lines (a plain
">" prompt is used for continuations), data lines may not. However new-	">" prompt is used for continuations), data lines may not. However new-
lines can be included in data by means of the \n escape (or \r, \r\n,	lines can be included in data by means of the \n escape (or \r, \r\n,
etc., depending on the newline sequence setting).	etc., depending on the newline sequence setting).


OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION	OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION

When the alternative matching function, pcre_dfa_exec(), is used (by	When the alternative matching function, pcre[16\|32]_dfa_exec(), is used
means of the \D escape sequence or the -dfa command line option), the	(by means of the \D escape sequence or the -dfa command line option),
output consists of a list of all the matches that start at the first	the output consists of a list of all the matches that start at the
point in the subject where there is at least one match. For example:	first point in the subject where there is at least one match. For exam-
	ple:

re> /(tang\|tangerine\|tan)/	re> /(tang\|tangerine\|tan)/
data> yellow tangerine\D	data> yellow tangerine\D
Line 670 CALLOUTS	Line 881 CALLOUTS
tion is called during matching. This works with both matching func-	tion is called during matching. This works with both matching func-
tions. By default, the called function displays the callout number, the	tions. By default, the called function displays the callout number, the
start and current positions in the text at the callout time, and the	start and current positions in the text at the callout time, and the
next pattern item to be tested. For example, the output	next pattern item to be tested. For example:

--->pqrabcdef	--->pqrabcdef
0 ^ ^ \d	0 ^ ^ \d

indicates that callout number 0 occurred for a match attempt starting	This output indicates that callout number 0 occurred for a match
at the fourth character of the subject string, when the pointer was at	attempt starting at the fourth character of the subject string, when
the seventh character of the data, and when the next pattern item was	the pointer was at the seventh character of the data, and when the next
\d. Just one circumflex is output if the start and current positions	pattern item was \d. Just one circumflex is output if the start and
are the same.	current positions are the same.

Callouts numbered 255 are assumed to be automatic callouts, inserted as	Callouts numbered 255 are assumed to be automatic callouts, inserted as
a result of the /C pattern modifier. In this case, instead of showing	a result of the /C pattern modifier. In this case, instead of showing
Line 779 SAVING AND RELOADING COMPILED PATTERNS	Line 990 SAVING AND RELOADING COMPILED PATTERNS
You can copy a file written by pcretest to a different host and reload	You can copy a file written by pcretest to a different host and reload
it there, even if the new host has opposite endianness to the one on	it there, even if the new host has opposite endianness to the one on
which the pattern was compiled. For example, you can compile on an i86	which the pattern was compiled. For example, you can compile on an i86
machine and run on a SPARC machine.	machine and run on a SPARC machine. When a pattern is reloaded on a
	host with different endianness, the confirmation message is changed to:

File names for saving and reloading can be absolute or relative, but	Compiled pattern (byte-inverted) loaded from /some/file
note that the shell facility of expanding a file name that starts with
	The test suite contains some saved pre-compiled patterns with different
	endianness. These are reloaded using "<!" instead of just "<". This
	suppresses the "(byte-inverted)" text so that the output is the same on
	all hosts. It also forces debugging output once the pattern has been
	reloaded.

	File names for saving and reloading can be absolute or relative, but
	note that the shell facility of expanding a file name that starts with
a tilde (~) is not available.	a tilde (~) is not available.

The ability to save and reload files in pcretest is intended for test-	The ability to save and reload files in pcretest is intended for test-
ing and experimentation. It is not intended for production use because	ing and experimentation. It is not intended for production use because
only a single pattern can be written to a file. Furthermore, there is	only a single pattern can be written to a file. Furthermore, there is
no facility for supplying custom character tables for use with a	no facility for supplying custom character tables for use with a
reloaded pattern. If the original pattern was compiled with custom	reloaded pattern. If the original pattern was compiled with custom
tables, an attempt to match a subject string using a reloaded pattern	tables, an attempt to match a subject string using a reloaded pattern
is likely to cause pcretest to crash. Finally, if you attempt to load	is likely to cause pcretest to crash. Finally, if you attempt to load
a file that is not in the correct format, the result is undefined.	a file that is not in the correct format, the result is undefined.


SEE ALSO	SEE ALSO

pcre(3), pcreapi(3), pcrecallout(3), pcrejit, pcrematching(3), pcrepar-	pcre(3), pcre16(3), pcre32(3), pcreapi(3), pcrecallout(3), pcrejit,
tial(d), pcrepattern(3), pcreprecompile(3).	pcrematching(3), pcrepartial(d), pcrepattern(3), pcreprecompile(3).


AUTHOR	AUTHOR
Line 810 AUTHOR	Line 1030 AUTHOR

REVISION	REVISION

Last updated: 02 December 2011	Last updated: 26 April 2013
Copyright (c) 1997-2011 University of Cambridge.	Copyright (c) 1997-2013 University of Cambridge.

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