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File Content: `pcrelimits.html`

<html>
<head>
<title>pcrelimits specification</title>
</head>
<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
<h1>pcrelimits man page</h1>
<p>
Return to the <a href="index.html">PCRE index page</a>.
</p>
<p>
This page is part of the PCRE HTML documentation. It was generated automatically
from the original man page. If there is any nonsense in it, please consult the
man page, in case the conversion went wrong.
<br>
<br><b>
SIZE AND OTHER LIMITATIONS
</b><br>
<P>
There are some size limitations in PCRE but it is hoped that they will never in
practice be relevant.
</P>
<P>
The maximum length of a compiled pattern is approximately 64K data units (bytes
for the 8-bit library, 32-bit units for the 32-bit library, and 32-bit units for
the 32-bit library) if PCRE is compiled with the default internal linkage size
of 2 bytes. If you want to process regular expressions that are truly enormous,
you can compile PCRE with an internal linkage size of 3 or 4 (when building the
16-bit or 32-bit library, 3 is rounded up to 4). See the <b>README</b> file in
the source distribution and the
<a href="pcrebuild.html"><b>pcrebuild</b></a>
documentation for details. In these cases the limit is substantially larger.
However, the speed of execution is slower.
</P>
<P>
All values in repeating quantifiers must be less than 65536.
</P>
<P>
There is no limit to the number of parenthesized subpatterns, but there can be
no more than 65535 capturing subpatterns.
</P>
<P>
There is a limit to the number of forward references to subsequent subpatterns
of around 200,000. Repeated forward references with fixed upper limits, for
example, (?2){0,100} when subpattern number 2 is to the right, are included in
the count. There is no limit to the number of backward references.
</P>
<P>
The maximum length of name for a named subpattern is 32 characters, and the
maximum number of named subpatterns is 10000.
</P>
<P>
The maximum length of a name in a (*MARK), (*PRUNE), (*SKIP), or (*THEN) verb
is 255 for the 8-bit library and 65535 for the 16-bit and 32-bit library.
</P>
<P>
The maximum length of a subject string is the largest positive number that an
integer variable can hold. However, when using the traditional matching
function, PCRE uses recursion to handle subpatterns and indefinite repetition.
This means that the available stack space may limit the size of a subject
string that can be processed by certain patterns. For a discussion of stack
issues, see the
<a href="pcrestack.html"><b>pcrestack</b></a>
documentation.
</P>
<br><b>
AUTHOR
</b><br>
<P>
Philip Hazel
<br>
University Computing Service
<br>
Cambridge CB2 3QH, England.
<br>
</P>
<br><b>
REVISION
</b><br>
<P>
Last updated: 04 May 2012
<br>
Copyright &copy; 1997-2012 University of Cambridge.
<br>
<p>
Return to the <a href="index.html">PCRE index page</a>.
</p>

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FILE FOLDER

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pcre-config.html	3635 bytes	0644
pcre.html	9386 bytes	0644
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File Content: pcrelimits.html

File Content: `pcrelimits.html`