/[pcre]/code/trunk/doc/pcrepartial.3
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revision 93 by nigel, Sat Feb 24 21:41:42 2007 UTC revision 169 by ph10, Mon Jun 4 10:49:21 2007 UTC
# Line 71  envisaged for this facility, this is not Line 71  envisaged for this facility, this is not
71  .P  .P
72  If PCRE_PARTIAL is set for a pattern that does not conform to the restrictions,  If PCRE_PARTIAL is set for a pattern that does not conform to the restrictions,
73  \fBpcre_exec()\fP returns the error code PCRE_ERROR_BADPARTIAL (-13).  \fBpcre_exec()\fP returns the error code PCRE_ERROR_BADPARTIAL (-13).
74    You can use the PCRE_INFO_OKPARTIAL call to \fBpcre_fullinfo()\fP to find out
75    if a compiled pattern can be used for partial matching.
76  .  .
77  .  .
78  .SH "EXAMPLE OF PARTIAL MATCHING USING PCRETEST"  .SH "EXAMPLE OF PARTIAL MATCHING USING PCRETEST"
# Line 99  pattern, but the first two are partial m Line 101  pattern, but the first two are partial m
101  \fBpcre_dfa_exec()\fP matching (by means of the \eD escape sequence), produces  \fBpcre_dfa_exec()\fP matching (by means of the \eD escape sequence), produces
102  the following output:  the following output:
103  .sp  .sp
104      re> /^\d?\d(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)\d\d$/      re> /^\ed?\ed(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)\ed\ed$/
105    data> 25jun04\eP\eD    data> 25jun04\eP\eD
106     0: 25jun04     0: 25jun04
107    data> 23dec3\eP\eD    data> 23dec3\eP\eD
# Line 126  space as before, because this is where d Line 128  space as before, because this is where d
128  are stored. Here is an example using \fBpcretest\fP, using the \eR escape  are stored. Here is an example using \fBpcretest\fP, using the \eR escape
129  sequence to set the PCRE_DFA_RESTART option (\eP and \eD are as above):  sequence to set the PCRE_DFA_RESTART option (\eP and \eD are as above):
130  .sp  .sp
131      re> /^\d?\d(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)\d\d$/      re> /^\ed?\ed(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)\ed\ed$/
132    data> 23ja\eP\eD    data> 23ja\eP\eD
133    Partial match: 23ja    Partial match: 23ja
134    data> n05\eR\eD    data> n05\eR\eD
# Line 157  bytes at the start of the buffer. Line 159  bytes at the start of the buffer.
159  always produce exactly the same result as matching over one single long string.  always produce exactly the same result as matching over one single long string.
160  The difference arises when there are multiple matching possibilities, because a  The difference arises when there are multiple matching possibilities, because a
161  partial match result is given only when there are no completed matches in a  partial match result is given only when there are no completed matches in a
162  call to fBpcre_dfa_exec()\fP. This means that as soon as the shortest match has  call to \fBpcre_dfa_exec()\fP. This means that as soon as the shortest match has
163  been found, continuation to a new subject segment is no longer possible.  been found, continuation to a new subject segment is no longer possible.
164  Consider this \fBpcretest\fP example:  Consider this \fBpcretest\fP example:
165  .sp  .sp
# Line 198  patterns or patterns such as: Line 200  patterns or patterns such as:
200  where no string can be a partial match for both alternatives.  where no string can be a partial match for both alternatives.
201  .  .
202  .  .
203  .P  .SH AUTHOR
204  .in 0  .rs
205  Last updated: 30 November 2006  .sp
206  .br  .nf
207  Copyright (c) 1997-2006 University of Cambridge.  Philip Hazel
208    University Computing Service
209    Cambridge CB2 3QH, England.
210    .fi
211    .
212    .
213    .SH REVISION
214    .rs
215    .sp
216    .nf
217    Last updated: 04 June 2007
218    Copyright (c) 1997-2007 University of Cambridge.
219    .fi
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