diff options
Diffstat (limited to 'pcre/doc/html/pcrematching.html')
| -rw-r--r-- | pcre/doc/html/pcrematching.html | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/pcre/doc/html/pcrematching.html b/pcre/doc/html/pcrematching.html index f1854314594..a1af39b68d3 100644 --- a/pcre/doc/html/pcrematching.html +++ b/pcre/doc/html/pcrematching.html @@ -126,6 +126,15 @@ character of the subject. The algorithm does not automatically move on to find matches that start at later positions. </P> <P> +PCRE's "auto-possessification" optimization usually applies to character +repeats at the end of a pattern (as well as internally). For example, the +pattern "a\d+" is compiled as if it were "a\d++" because there is no point +even considering the possibility of backtracking into the repeated digits. For +DFA matching, this means that only one possible match is found. If you really +do want multiple matches in such cases, either use an ungreedy repeat +("a\d+?") or set the PCRE_NO_AUTO_POSSESS option when compiling. +</P> +<P> There are a number of features of PCRE regular expressions that are not supported by the alternative matching algorithm. They are as follows: </P> @@ -224,7 +233,7 @@ Cambridge CB2 3QH, England. </P> <br><a name="SEC8" href="#TOC1">REVISION</a><br> <P> -Last updated: 08 January 2012 +Last updated: 12 November 2013 <br> Copyright © 1997-2012 University of Cambridge. <br> |