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PCRELIMITS(3)							 PCRELIMITS(3)

NAME
       PCRE - Perl-compatible regular expressions

SIZE AND OTHER LIMITATIONS

       There  are some size limitations in PCRE but it is hoped that they will
       never in practice be relevant.

       The maximum length of a compiled pattern is 65539 (sic) bytes  if  PCRE
       is compiled with the default internal linkage size of 2. If you want to
       process regular expressions that are truly enormous,  you  can  compile
       PCRE  with  an  internal linkage size of 3 or 4 (see the README file in
       the source distribution and the pcrebuild documentation	for  details).
       In  these  cases the limit is substantially larger.  However, the speed
       of execution is slower.

       All values in repeating quantifiers must be less than 65536.

       There is no limit to the number of parenthesized subpatterns, but there
       can be no more than 65535 capturing subpatterns.

       There is a limit to the number of forward references to subsequent sub‐
       patterns 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.

       The maximum length of name for a named subpattern is 32 characters, and
       the maximum number of named subpatterns is 10000.

       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 indef‐
       inite  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 pcrestack documentation.

AUTHOR

       Philip Hazel
       University Computing Service
       Cambridge CB2 3QH, England.

REVISION

       Last updated: 30 November 2011
       Copyright (c) 1997-2011 University of Cambridge.

								 PCRELIMITS(3)
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