/[pcre]/code/trunk/doc/pcrestack.3
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revision 93 by nigel, Sat Feb 24 21:41:42 2007 UTC revision 122 by ph10, Mon Mar 12 15:10:25 2007 UTC
# Line 52  frame for each matched character. For a Line 52  frame for each matched character. For a
52  required. Consider now this rewritten pattern, which matches exactly the same  required. Consider now this rewritten pattern, which matches exactly the same
53  strings:  strings:
54  .sp  .sp
55    ([^<]++|<(?!inet))    ([^<]++|<(?!inet))+
56  .sp  .sp
57  This uses very much less stack, because runs of characters that do not contain  This uses very much less stack, because runs of characters that do not contain
58  "<" are "swallowed" in one item inside the parentheses. Recursion happens only  "<" are "swallowed" in one item inside the parentheses. Recursion happens only
# Line 113  recursion. Thus, if you want to limit yo Line 113  recursion. Thus, if you want to limit yo
113  should set the limit at 16000 recursions. A 64Mb stack, on the other hand, can  should set the limit at 16000 recursions. A 64Mb stack, on the other hand, can
114  support around 128000 recursions. The \fBpcretest\fP test program has a command  support around 128000 recursions. The \fBpcretest\fP test program has a command
115  line option (\fB-S\fP) that can be used to increase the size of its stack.  line option (\fB-S\fP) that can be used to increase the size of its stack.
116  .P  .
117  .in 0  .
118  Last updated: 14 September 2006  .SH AUTHOR
119  .br  .rs
120  Copyright (c) 1997-2006 University of Cambridge.  .sp
121    .nf
122    Philip Hazel
123    University Computing Service
124    Cambridge CB2 3QH, England.
125    .fi
126    .
127    .
128    .SH REVISION
129    .rs
130    .sp
131    .nf
132    Last updated: 12 March 2007
133    Copyright (c) 1997-2007 University of Cambridge.
134    .fi
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