/[pcre]/code/trunk/doc/pcrecpp.3
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revision 392 by ph10, Tue Mar 17 21:30:30 2009 UTC revision 583 by ph10, Tue Jan 11 16:49:55 2011 UTC
# Line 195  which returns true if the modifier is se Line 195  which returns true if the modifier is se
195    RE_Options & set_caseless(bool)    RE_Options & set_caseless(bool)
196  .sp  .sp
197  which sets or unsets the modifier. Moreover, PCRE_EXTRA_MATCH_LIMIT can be  which sets or unsets the modifier. Moreover, PCRE_EXTRA_MATCH_LIMIT can be
198  accessed through the \fBset_match_limit()\fR and \fBmatch_limit()\fR member  accessed through the \fBset_match_limit()\fP and \fBmatch_limit()\fP member
199  functions. Setting \fImatch_limit\fR to a non-zero value will limit the  functions. Setting \fImatch_limit\fP to a non-zero value will limit the
200  execution of pcre to keep it from doing bad things like blowing the stack or  execution of pcre to keep it from doing bad things like blowing the stack or
201  taking an eternity to return a result. A value of 5000 is good enough to stop  taking an eternity to return a result. A value of 5000 is good enough to stop
202  stack blowup in a 2MB thread stack. Setting \fImatch_limit\fR to zero disables  stack blowup in a 2MB thread stack. Setting \fImatch_limit\fP to zero disables
203  match limiting. Alternatively, you can call \fBmatch_limit_recursion()\fP  match limiting. Alternatively, you can call \fBmatch_limit_recursion()\fP
204  which uses PCRE_EXTRA_MATCH_LIMIT_RECURSION to limit how much PCRE  which uses PCRE_EXTRA_MATCH_LIMIT_RECURSION to limit how much PCRE
205  recurses. \fBmatch_limit()\fP limits the number of matches PCRE does;  recurses. \fBmatch_limit()\fP limits the number of matches PCRE does;
# Line 207  recurses. \fBmatch_limit()\fP limits the Line 207  recurses. \fBmatch_limit()\fP limits the
207  therefore the amount of stack that is used.  therefore the amount of stack that is used.
208  .P  .P
209  Normally, to pass one or more modifiers to a RE class, you declare  Normally, to pass one or more modifiers to a RE class, you declare
210  a \fIRE_Options\fR object, set the appropriate options, and pass this  a \fIRE_Options\fP object, set the appropriate options, and pass this
211  object to a RE constructor. Example:  object to a RE constructor. Example:
212  .sp  .sp
213     RE_options opt;     RE_options opt;
# Line 216  object to a RE constructor. Example: Line 216  object to a RE constructor. Example:
216  .sp  .sp
217  RE_options has two constructors. The default constructor takes no arguments and  RE_options has two constructors. The default constructor takes no arguments and
218  creates a set of flags that are off by default. The optional parameter  creates a set of flags that are off by default. The optional parameter
219  \fIoption_flags\fR is to facilitate transfer of legacy code from C programs.  \fIoption_flags\fP is to facilitate transfer of legacy code from C programs.
220  This lets you do  This lets you do
221  .sp  .sp
222     RE(pattern,     RE(pattern,
# Line 230  However, new code is better off doing Line 230  However, new code is better off doing
230  .sp  .sp
231  If you are going to pass one of the most used modifiers, there are some  If you are going to pass one of the most used modifiers, there are some
232  convenience functions that return a RE_Options class with the  convenience functions that return a RE_Options class with the
233  appropriate modifier already set: \fBCASELESS()\fR, \fBUTF8()\fR,  appropriate modifier already set: \fBCASELESS()\fP, \fBUTF8()\fP,
234  \fBMULTILINE()\fR, \fBDOTALL\fR(), and \fBEXTENDED()\fR.  \fBMULTILINE()\fP, \fBDOTALL\fP(), and \fBEXTENDED()\fP.
235  .P  .P
236  If you need to set several options at once, and you don't want to go through  If you need to set several options at once, and you don't want to go through
237  the pains of declaring a RE_Options object and setting several options, there  the pains of declaring a RE_Options object and setting several options, there
238  is a parallel method that give you such ability on the fly. You can concatenate  is a parallel method that give you such ability on the fly. You can concatenate
239  several \fBset_xxxxx()\fR member functions, since each of them returns a  several \fBset_xxxxx()\fP member functions, since each of them returns a
240  reference to its class object. For example, to pass PCRE_CASELESS,  reference to its class object. For example, to pass PCRE_CASELESS,
241  PCRE_EXTENDED, and PCRE_MULTILINE to a RE with one statement, you may write:  PCRE_EXTENDED, and PCRE_MULTILINE to a RE with one statement, you may write:
242  .sp  .sp
# Line 260  is defined in the pcrecpp namespace. Line 260  is defined in the pcrecpp namespace.
260    Example: read lines of the form "var = value" from a string.    Example: read lines of the form "var = value" from a string.
261       string contents = ...;                 // Fill string somehow       string contents = ...;                 // Fill string somehow
262       pcrecpp::StringPiece input(contents);  // Wrap in a StringPiece       pcrecpp::StringPiece input(contents);  // Wrap in a StringPiece
263    .sp
264       string var;       string var;
265       int value;       int value;
266       pcrecpp::RE re("(\e\ew+) = (\e\ed+)\en");       pcrecpp::RE re("(\e\ew+) = (\e\ed+)\en");
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