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.TH PCRELIMITS 3 | .TH PCRELIMITS 3 "24 June 2012" "PCRE 8.30" |
.SH NAME |
.SH NAME |
PCRE - Perl-compatible regular expressions |
PCRE - Perl-compatible regular expressions |
.SH "SIZE AND OTHER LIMITATIONS" |
.SH "SIZE AND OTHER LIMITATIONS" |
Line 8 There are some size limitations in PCRE but it is hope
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Line 8 There are some size limitations in PCRE but it is hope
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practice be relevant. |
practice be relevant. |
.P |
.P |
The maximum length of a compiled pattern is approximately 64K data units (bytes |
The maximum length of a compiled pattern is approximately 64K data units (bytes |
for the 8-bit library, 16-bit units for the 16-bit library) if PCRE is compiled | for the 8-bit library, 32-bit units for the 32-bit library, and 32-bit units for |
with the default internal linkage size of 2 bytes. If you want to process | the 32-bit library) if PCRE is compiled with the default internal linkage size |
regular expressions that are truly enormous, you can compile PCRE with an | of 2 bytes. If you want to process regular expressions that are truly enormous, |
internal linkage size of 3 or 4 (when building the 16-bit library, 3 is rounded | you can compile PCRE with an internal linkage size of 3 or 4 (when building the |
up to 4). See the \fBREADME\fP file in the source distribution and the | 16-bit or 32-bit library, 3 is rounded up to 4). See the \fBREADME\fP file in |
| the source distribution and the |
.\" HREF |
.\" HREF |
\fBpcrebuild\fP |
\fBpcrebuild\fP |
.\" |
.\" |
Line 32 the count. There is no limit to the number of backward
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Line 33 the count. There is no limit to the number of backward
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The maximum length of name for a named subpattern is 32 characters, and the |
The maximum length of name for a named subpattern is 32 characters, and the |
maximum number of named subpatterns is 10000. |
maximum number of named subpatterns is 10000. |
.P |
.P |
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The maximum length of a name in a (*MARK), (*PRUNE), (*SKIP), or (*THEN) verb |
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is 255 for the 8-bit library and 65535 for the 16-bit and 32-bit library. |
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.P |
The maximum length of a subject string is the largest positive number that an |
The maximum length of a subject string is the largest positive number that an |
integer variable can hold. However, when using the traditional matching |
integer variable can hold. However, when using the traditional matching |
function, PCRE uses recursion to handle subpatterns and indefinite repetition. |
function, PCRE uses recursion to handle subpatterns and indefinite repetition. |
Line 58 Cambridge CB2 3QH, England.
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Line 62 Cambridge CB2 3QH, England.
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.rs |
.rs |
.sp |
.sp |
.nf |
.nf |
Last updated: 08 January 2012 | Last updated: 04 May 2012 |
Copyright (c) 1997-2012 University of Cambridge. |
Copyright (c) 1997-2012 University of Cambridge. |
.fi |
.fi |