/[pcre]/code/trunk/doc/pcrepattern.3
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revision 745 by ph10, Mon Nov 14 11:41:03 2011 UTC revision 758 by ph10, Mon Nov 21 12:05:36 2011 UTC
# Line 328  Note that octal values of 100 or greater Line 328  Note that octal values of 100 or greater
328  zero, because no more than three octal digits are ever read.  zero, because no more than three octal digits are ever read.
329  .P  .P
330  All the sequences that define a single character value can be used both inside  All the sequences that define a single character value can be used both inside
331  and outside character classes. In addition, inside a character class, the  and outside character classes. In addition, inside a character class, \eb is
332  sequence \eb is interpreted as the backspace character (hex 08). The sequences  interpreted as the backspace character (hex 08).
333  \eB, \eN, \eR, and \eX are not special inside a character class. Like any other  .P
334  unrecognized escape sequences, they are treated as the literal characters "B",  \eN is not allowed in a character class. \eB, \eR, and \eX are not special
335  "N", "R", and "X" by default, but cause an error if the PCRE_EXTRA option is  inside a character class. Like other unrecognized escape sequences, they are
336  set. Outside a character class, these sequences have different meanings.  treated as the literal characters "B", "R", and "X" by default, but cause an
337    error if the PCRE_EXTRA option is set. Outside a character class, these
338    sequences have different meanings.
339  .  .
340  .  .
341  .SS "Unsupported escape sequences"  .SS "Unsupported escape sequences"
# Line 1003  processing unless the PCRE_NO_UTF8_CHECK Line 1005  processing unless the PCRE_NO_UTF8_CHECK
1005  PCRE does not allow \eC to appear in lookbehind assertions  PCRE does not allow \eC to appear in lookbehind assertions
1006  .\" HTML <a href="#lookbehind">  .\" HTML <a href="#lookbehind">
1007  .\" </a>  .\" </a>
1008  (described below),  (described below)
1009  .\"  .\"
1010  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
1011  the lookbehind.  the lookbehind.
1012  .P  .P
1013  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 1972  temporarily move the current position ba
1972  match. If there are insufficient characters before the current position, the  match. If there are insufficient characters before the current position, the
1973  assertion fails.  assertion fails.
1974  .P  .P
1975  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,
1976  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
1977  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,
1978  different numbers of bytes, are also not permitted.  which can match different numbers of bytes, are also not permitted.
1979  .P  .P
1980  .\" HTML <a href="#subpatternsassubroutines">  .\" HTML <a href="#subpatternsassubroutines">
1981  .\" </a>  .\" </a>
# Line 2874  Cambridge CB2 3QH, England. Line 2876  Cambridge CB2 3QH, England.
2876  .rs  .rs
2877  .sp  .sp
2878  .nf  .nf
2879  Last updated: 14 November 2011  Last updated: 19 November 2011
2880  Copyright (c) 1997-2011 University of Cambridge.  Copyright (c) 1997-2011 University of Cambridge.
2881  .fi  .fi
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