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.TH PCRE 3 | .TH PCRE 3 "10 January 2012" "PCRE 8.30" |
.SH NAME |
.SH NAME |
PCRE - Perl-compatible regular expressions |
PCRE - Perl-compatible regular expressions |
.SH INTRODUCTION |
.SH INTRODUCTION |
Line 11 appeared in Perl are also available using the Python s
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Line 11 appeared in Perl are also available using the Python s
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support for one or two .NET and Oniguruma syntax items, and there is an option |
support for one or two .NET and Oniguruma syntax items, and there is an option |
for requesting some minor changes that give better JavaScript compatibility. |
for requesting some minor changes that give better JavaScript compatibility. |
.P |
.P |
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Starting with release 8.30, it is possible to compile two separate PCRE |
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libraries: the original, which supports 8-bit character strings (including |
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UTF-8 strings), and a second library that supports 16-bit character strings |
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(including UTF-16 strings). The build process allows either one or both to be |
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built. The majority of the work to make this possible was done by Zoltan |
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Herczeg. |
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.P |
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The two libraries contain identical sets of functions, except that the names in |
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the 16-bit library start with \fBpcre16_\fP instead of \fBpcre_\fP. To avoid |
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over-complication and reduce the documentation maintenance load, most of the |
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documentation describes the 8-bit library, with the differences for the 16-bit |
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library described separately in the |
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.\" HREF |
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\fBpcre16\fP |
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.\" |
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page. References to functions or structures of the form \fIpcre[16]_xxx\fP |
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should be read as meaning "\fIpcre_xxx\fP when using the 8-bit library and |
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\fIpcre16_xxx\fP when using the 16-bit library". |
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.P |
The current implementation of PCRE corresponds approximately with Perl 5.12, |
The current implementation of PCRE corresponds approximately with Perl 5.12, |
including support for UTF-8 encoded strings and Unicode general category | including support for UTF-8/16 encoded strings and Unicode general category |
properties. However, UTF-8 and Unicode support has to be explicitly enabled; it | properties. However, UTF-8/16 and Unicode support has to be explicitly enabled; |
is not the default. The Unicode tables correspond to Unicode release 6.0.0. | it is not the default. The Unicode tables correspond to Unicode release 6.0.0. |
.P |
.P |
In addition to the Perl-compatible matching function, PCRE contains an |
In addition to the Perl-compatible matching function, PCRE contains an |
alternative function that matches the same compiled patterns in a different |
alternative function that matches the same compiled patterns in a different |
Line 27 page.
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Line 46 page.
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.P |
.P |
PCRE is written in C and released as a C library. A number of people have |
PCRE is written in C and released as a C library. A number of people have |
written wrappers and interfaces of various kinds. In particular, Google Inc. |
written wrappers and interfaces of various kinds. In particular, Google Inc. |
have provided a comprehensive C++ wrapper. This is now included as part of the | have provided a comprehensive C++ wrapper for the 8-bit library. This is now |
PCRE distribution. The | included as part of the PCRE distribution. The |
.\" HREF |
.\" HREF |
\fBpcrecpp\fP |
\fBpcrecpp\fP |
.\" |
.\" |
Line 68 page. Documentation about building PCRE for various op
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Line 87 page. Documentation about building PCRE for various op
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found in the \fBREADME\fP and \fBNON-UNIX-USE\fP files in the source |
found in the \fBREADME\fP and \fBNON-UNIX-USE\fP files in the source |
distribution. |
distribution. |
.P |
.P |
The library contains a number of undocumented internal functions and data | The libraries contains a number of undocumented internal functions and data |
tables that are used by more than one of the exported external functions, but |
tables that are used by more than one of the exported external functions, but |
which are not intended for use by external callers. Their names all begin with |
which are not intended for use by external callers. Their names all begin with |
"_pcre_", which hopefully will not provoke any name clashes. In some | "_pcre_" or "_pcre16_", which hopefully will not provoke any name clashes. In |
environments, it is possible to control which external symbols are exported | some environments, it is possible to control which external symbols are |
when a shared library is built, and in these cases the undocumented symbols are | exported when a shared library is built, and in these cases the undocumented |
not exported. | symbols are not exported. |
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. |
. |
. |
.SH "USER DOCUMENTATION" |
.SH "USER DOCUMENTATION" |
Line 87 all the sections, except the \fBpcredemo\fP section, a
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Line 106 all the sections, except the \fBpcredemo\fP section, a
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of searching. The sections are as follows: |
of searching. The sections are as follows: |
.sp |
.sp |
pcre this document |
pcre this document |
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pcre16 details of the 16-bit library |
pcre-config show PCRE installation configuration information |
pcre-config show PCRE installation configuration information |
pcreapi details of PCRE's native C API |
pcreapi details of PCRE's native C API |
pcrebuild options for building PCRE |
pcrebuild options for building PCRE |
pcrecallout details of the callout feature |
pcrecallout details of the callout feature |
pcrecompat discussion of Perl compatibility |
pcrecompat discussion of Perl compatibility |
pcrecpp details of the C++ wrapper | pcrecpp details of the C++ wrapper for the 8-bit library |
pcredemo a demonstration C program that uses PCRE |
pcredemo a demonstration C program that uses PCRE |
pcregrep description of the \fBpcregrep\fP command | pcregrep description of the \fBpcregrep\fP command (8-bit only) |
pcrejit discussion of the just-in-time optimization support |
pcrejit discussion of the just-in-time optimization support |
pcrelimits details of size and other limits |
pcrelimits details of size and other limits |
pcrematching discussion of the two matching algorithms |
pcrematching discussion of the two matching algorithms |
Line 103 of searching. The sections are as follows:
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Line 123 of searching. The sections are as follows:
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pcrepattern syntax and semantics of supported |
pcrepattern syntax and semantics of supported |
regular expressions |
regular expressions |
pcreperform discussion of performance issues |
pcreperform discussion of performance issues |
pcreposix the POSIX-compatible C API | pcreposix the POSIX-compatible C API for the 8-bit library |
pcreprecompile details of saving and re-using precompiled patterns |
pcreprecompile details of saving and re-using precompiled patterns |
pcresample discussion of the pcredemo program |
pcresample discussion of the pcredemo program |
pcrestack discussion of stack usage |
pcrestack discussion of stack usage |
pcresyntax quick syntax reference |
pcresyntax quick syntax reference |
pcretest description of the \fBpcretest\fP testing command |
pcretest description of the \fBpcretest\fP testing command |
pcreunicode discussion of Unicode and UTF-8 support | pcreunicode discussion of Unicode and UTF-8/16 support |
.sp |
.sp |
In addition, in the "man" and HTML formats, there is a short page for each |
In addition, in the "man" and HTML formats, there is a short page for each |
C library function, listing its arguments and results. | 8-bit C library function, listing its arguments and results. |
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.SH AUTHOR |
.SH AUTHOR |
Line 133 two digits 10, at the domain cam.ac.uk.
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Line 153 two digits 10, at the domain cam.ac.uk.
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.rs |
.rs |
.sp |
.sp |
.nf |
.nf |
Last updated: 24 August 2011 | Last updated: 10 January 2012 |
Copyright (c) 1997-2011 University of Cambridge. | Copyright (c) 1997-2012 University of Cambridge. |
.fi |
.fi |