/[pcre]/code/trunk/doc/pcreapi.3
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revision 224 by ph10, Thu Aug 9 09:52:43 2007 UTC revision 225 by ph10, Mon Aug 20 14:38:34 2007 UTC
# Line 1198  pattern. When PCRE_NEWLINE_CRLF, PCRE_NE Line 1198  pattern. When PCRE_NEWLINE_CRLF, PCRE_NE
1198  set, and a match attempt fails when the current position is at a CRLF sequence,  set, and a match attempt fails when the current position is at a CRLF sequence,
1199  the match position is advanced by two characters instead of one, in other  the match position is advanced by two characters instead of one, in other
1200  words, to after the CRLF.  words, to after the CRLF.
1201    .P
1202    Anomalous effects can occur when CRLF is a valid newline sequence and explicit
1203    \er or \en escapes appear in the pattern. For example, the string "\er\enA"
1204    matches the unanchored pattern \enA but not [X\en]A. This happens because, in
1205    the first case, PCRE knows that the match must start with \en, and so it skips
1206    there before trying to match. In the second case, it has no knowledge about the
1207    starting character, so it starts matching at the beginning of the string, and
1208    on failing, skips over the CRLF as described above. However, if the pattern is
1209    studied, the match succeeds, because then PCRE once again knows where to start.
1210  .sp  .sp
1211    PCRE_NOTBOL    PCRE_NOTBOL
1212  .sp  .sp
# Line 1886  Cambridge CB2 3QH, England. Line 1895  Cambridge CB2 3QH, England.
1895  .rs  .rs
1896  .sp  .sp
1897  .nf  .nf
1898  Last updated: 09 August 2007  Last updated: 20 August 2007
1899  Copyright (c) 1997-2007 University of Cambridge.  Copyright (c) 1997-2007 University of Cambridge.
1900  .fi  .fi
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