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+<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, 16-bit units for the 16-bit library, and 32-bit units for
+the 32-bit library) if PCRE is compiled with the default internal linkage size,
+which is 2 bytes for the 8-bit and 16-bit libraries, and 4 bytes for the 32-bit
+library. 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. There is, however, a limit to the
+depth of nesting of parenthesized subpatterns of all kinds. This is imposed in
+order to limit the amount of system stack used at compile time. The limit can
+be specified when PCRE is built; the default is 250.
+</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 libraries.
+</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: 05 November 2013
+<br>
+Copyright &copy; 1997-2013 University of Cambridge.
+<br>
+<p>
+Return to the <a href="index.html">PCRE index page</a>.
+</p>