/[pcre]/code/trunk/doc/pcrepattern.3
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revision 1265 by ph10, Wed Feb 27 15:41:22 2013 UTC revision 1266 by ph10, Sun Mar 3 11:14:26 2013 UTC
# Line 1  Line 1 
1  .TH PCREPATTERN 3 "27 February 2013" "PCRE 8.33"  .TH PCREPATTERN 3 "03 March 2013" "PCRE 8.33"
2  .SH NAME  .SH NAME
3  PCRE - Perl-compatible regular expressions  PCRE - Perl-compatible regular expressions
4  .SH "PCRE REGULAR EXPRESSION DETAILS"  .SH "PCRE REGULAR EXPRESSION DETAILS"
# Line 2640  For example, this pattern has two callou Line 2640  For example, this pattern has two callou
2640  .sp  .sp
2641  If the PCRE_AUTO_CALLOUT flag is passed to a compiling function, callouts are  If the PCRE_AUTO_CALLOUT flag is passed to a compiling function, callouts are
2642  automatically installed before each item in the pattern. They are all numbered  automatically installed before each item in the pattern. They are all numbered
2643  255.  255. If there is a conditional group in the pattern whose condition is an
2644    assertion, an additional callout is inserted just before the condition. An
2645    explicit callout may also be set at this position, as in this example:
2646    .sp
2647      (?(?C9)(?=a)abc|def)
2648    .sp
2649    Note that this applies only to assertion conditions, not to other types of
2650    condition.
2651  .P  .P
2652  During matching, when PCRE reaches a callout point, the external function is  During matching, when PCRE reaches a callout point, the external function is
2653  called. It is provided with the number of the callout, the position in the  called. It is provided with the number of the callout, the position in the
# Line 2989  Cambridge CB2 3QH, England. Line 2996  Cambridge CB2 3QH, England.
2996  .rs  .rs
2997  .sp  .sp
2998  .nf  .nf
2999  Last updated: 27 February 2013  Last updated: 03 March 2013
3000  Copyright (c) 1997-2013 University of Cambridge.  Copyright (c) 1997-2013 University of Cambridge.
3001  .fi  .fi

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