/[pcre]/code/trunk/doc/pcresyntax.3
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revision 209 by ph10, Mon Aug 6 15:23:29 2007 UTC revision 210 by ph10, Wed Aug 8 14:24:50 2007 UTC
# Line 348  Each top-level branch of a look behind m Line 348  Each top-level branch of a look behind m
348    (?(assert)...  assertion condition    (?(assert)...  assertion condition
349  .  .
350  .  .
351    .SH "BACKTRACKING CONTROL"
352    .rs
353    .sp
354    The following act immediately they are reached:
355    .sp
356      (*ACCEPT)      force successful match
357      (*FAIL)        force backtrack; synonym (*F)
358    .sp
359    The following act only when a subsequent match failure causes a backtrack to
360    reach them. They all force a match failure, but they differ in what happens
361    afterwards. Those that advance the start-of-match point do so only if the
362    pattern is not anchored.
363    .sp
364      (*COMMIT)      overall failure, no advance of starting point
365      (*PRUNE)       advance to next starting character
366      (*SKIP)        advance start to current matching position
367      (*THEN)        local failure, backtrack to next alternation
368    .
369    .
370  .SH "CALLOUTS"  .SH "CALLOUTS"
371  .rs  .rs
372  .sp  .sp
# Line 376  Cambridge CB2 3QH, England. Line 395  Cambridge CB2 3QH, England.
395  .rs  .rs
396  .sp  .sp
397  .nf  .nf
398  Last updated: 06 August 2007  Last updated: 08 August 2007
399  Copyright (c) 1997-2007 University of Cambridge.  Copyright (c) 1997-2007 University of Cambridge.
400  .fi  .fi
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