/[pcre]/code/trunk/doc/pcrepattern.3
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revision 745 by ph10, Mon Nov 14 11:41:03 2011 UTC revision 754 by ph10, Sat Nov 19 18:32:18 2011 UTC
# Line 1003  processing unless the PCRE_NO_UTF8_CHECK Line 1003  processing unless the PCRE_NO_UTF8_CHECK
1003  PCRE does not allow \eC to appear in lookbehind assertions  PCRE does not allow \eC to appear in lookbehind assertions
1004  .\" HTML <a href="#lookbehind">  .\" HTML <a href="#lookbehind">
1005  .\" </a>  .\" </a>
1006  (described below),  (described below)
1007  .\"  .\"
1008  because in UTF-8 mode this would make it impossible to calculate the length of  in UTF-8 mode, because this would make it impossible to calculate the length of
1009  the lookbehind.  the lookbehind.
1010  .P  .P
1011  In general, the \eC escape sequence is best avoided in UTF-8 mode. However, one  In general, the \eC escape sequence is best avoided in UTF-8 mode. However, one
# Line 1970  temporarily move the current position ba Line 1970  temporarily move the current position ba
1970  match. If there are insufficient characters before the current position, the  match. If there are insufficient characters before the current position, the
1971  assertion fails.  assertion fails.
1972  .P  .P
1973  PCRE does not allow the \eC escape (which matches a single byte in UTF-8 mode)  In UTF-8 mode, PCRE does not allow the \eC escape (which matches a single byte,
1974  to appear in lookbehind assertions, because it makes it impossible to calculate  even in UTF-8 mode) to appear in lookbehind assertions, because it makes it
1975  the length of the lookbehind. The \eX and \eR escapes, which can match  impossible to calculate the length of the lookbehind. The \eX and \eR escapes,
1976  different numbers of bytes, are also not permitted.  which can match different numbers of bytes, are also not permitted.
1977  .P  .P
1978  .\" HTML <a href="#subpatternsassubroutines">  .\" HTML <a href="#subpatternsassubroutines">
1979  .\" </a>  .\" </a>
# Line 2874  Cambridge CB2 3QH, England. Line 2874  Cambridge CB2 3QH, England.
2874  .rs  .rs
2875  .sp  .sp
2876  .nf  .nf
2877  Last updated: 14 November 2011  Last updated: 19 November 2011
2878  Copyright (c) 1997-2011 University of Cambridge.  Copyright (c) 1997-2011 University of Cambridge.
2879  .fi  .fi

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