/[pcre]/code/trunk/doc/pcrepattern.3
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revision 416 by ph10, Sat Apr 11 14:34:02 2009 UTC revision 447 by ph10, Tue Sep 15 18:17:54 2009 UTC
# Line 2135  a backtracking algorithm. With the excep Line 2135  a backtracking algorithm. With the excep
2135  failing negative assertion, they cause an error if encountered by  failing negative assertion, they cause an error if encountered by
2136  \fBpcre_dfa_exec()\fP.  \fBpcre_dfa_exec()\fP.
2137  .P  .P
2138    If any of these verbs are used in an assertion subpattern, their effect is
2139    confined to that subpattern; it does not extend to the surrounding pattern.
2140    Note that assertion subpatterns are processed as anchored at the point where
2141    they are tested.
2142    .P
2143  The new verbs make use of what was previously invalid syntax: an opening  The new verbs make use of what was previously invalid syntax: an opening
2144  parenthesis followed by an asterisk. In Perl, they are generally of the form  parenthesis followed by an asterisk. In Perl, they are generally of the form
2145  (*VERB:ARG) but PCRE does not support the use of arguments, so its general  (*VERB:ARG) but PCRE does not support the use of arguments, so its general
# Line 2150  The following verbs act as soon as they Line 2155  The following verbs act as soon as they
2155  .sp  .sp
2156  This verb causes the match to end successfully, skipping the remainder of the  This verb causes the match to end successfully, skipping the remainder of the
2157  pattern. When inside a recursion, only the innermost pattern is ended  pattern. When inside a recursion, only the innermost pattern is ended
2158  immediately. PCRE differs from Perl in what happens if the (*ACCEPT) is inside  immediately. If the (*ACCEPT) is inside capturing parentheses, the data so far
2159  capturing parentheses. In Perl, the data so far is captured: in PCRE no data is  is captured. (This feature was added to PCRE at release 8.00.) For example:
 captured. For example:  
2160  .sp  .sp
2161    A(A|B(*ACCEPT)|C)D    A((?:A|B(*ACCEPT)|C)D)
2162  .sp  .sp
2163  This matches "AB", "AAD", or "ACD", but when it matches "AB", no data is  This matches "AB", "AAD", or "ACD"; when it matches "AB", "B" is captured by
2164  captured.  the outer parentheses.
2165  .sp  .sp
2166    (*FAIL) or (*F)    (*FAIL) or (*F)
2167  .sp  .sp
# Line 2254  Cambridge CB2 3QH, England. Line 2258  Cambridge CB2 3QH, England.
2258  .rs  .rs
2259  .sp  .sp
2260  .nf  .nf
2261  Last updated: 11 April 2009  Last updated: 15 September 2009
2262  Copyright (c) 1997-2009 University of Cambridge.  Copyright (c) 1997-2009 University of Cambridge.
2263  .fi  .fi
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