/[pcre]/code/trunk/doc/pcreperform.3
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revision 517 by ph10, Sun Mar 7 12:05:20 2010 UTC revision 518 by ph10, Tue May 18 15:47:01 2010 UTC
# Line 96  thousand characters whenever it needs a Line 96  thousand characters whenever it needs a
96  an alternative pattern that does not use character properties, it will probably  an alternative pattern that does not use character properties, it will probably
97  be faster.  be faster.
98  .P  .P
99    By default, the escape sequences \eb, \ed, \es, and \ew, and the POSIX
100    character classes such as [:alpha:] do not use Unicode properties, partly for
101    backwards compatibility, and partly for performance reasons. However, you can
102    set PCRE_UCP if you want Unicode character properties to be used. This can
103    double the matching time for items such as \ed, when matched with
104    \fBpcre_exec()\fP; the performance loss is less with \fBpcre_dfa_exec()\fP, and
105    in both cases there is not much difference for \eb.
106    .P
107  When a pattern begins with .* not in parentheses, or in parentheses that are  When a pattern begins with .* not in parentheses, or in parentheses that are
108  not the subject of a backreference, and the PCRE_DOTALL option is set, the  not the subject of a backreference, and the PCRE_DOTALL option is set, the
109  pattern is implicitly anchored by PCRE, since it can match only at the start of  pattern is implicitly anchored by PCRE, since it can match only at the start of
# Line 164  Cambridge CB2 3QH, England. Line 172  Cambridge CB2 3QH, England.
172  .rs  .rs
173  .sp  .sp
174  .nf  .nf
175  Last updated: 07 March 2010  Last updated: 16 May 2010
176  Copyright (c) 1997-2010 University of Cambridge.  Copyright (c) 1997-2010 University of Cambridge.
177  .fi  .fi

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