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-.TH PCRELIMITS 3 "04 May 2012" "PCRE 8.30"
-.SH NAME
-PCRE - Perl-compatible regular expressions
-.SH "SIZE AND OTHER LIMITATIONS"
-.rs
-.sp
-There are some size limitations in PCRE but it is hoped that they will never in
-practice be relevant.
-.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) 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 library, 3 is rounded
-up to 4). See the \fBREADME\fP file in the source distribution and the
-.\" HREF
-\fBpcrebuild\fP
-.\"
-documentation for details. In these cases the limit is substantially larger.
-However, the speed of execution is slower.
-.P
-All values in repeating quantifiers must be less than 65536.
-.P
-There is no limit to the number of parenthesized subpatterns, but there can be
-no more than 65535 capturing subpatterns.
-.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
-The maximum length of name for a named subpattern is 32 characters, and the
-maximum number of named subpatterns is 10000.
-.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 library.
-.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
-.\" HREF
-\fBpcrestack\fP
-.\"
-documentation.
-.
-.
-.SH AUTHOR
-.rs
-.sp
-.nf
-Philip Hazel
-University Computing Service
-Cambridge CB2 3QH, England.
-.fi
-.
-.
-.SH REVISION
-.rs
-.sp
-.nf
-Last updated: 04 May 2012
-Copyright (c) 1997-2012 University of Cambridge.
-.fi