diff options
Diffstat (limited to 'ext/pcre/pcrelib/doc/pcre.txt')
| -rw-r--r-- | ext/pcre/pcrelib/doc/pcre.txt | 32 |
1 files changed, 12 insertions, 20 deletions
diff --git a/ext/pcre/pcrelib/doc/pcre.txt b/ext/pcre/pcrelib/doc/pcre.txt index 95f148f3de..46ede59754 100644 --- a/ext/pcre/pcrelib/doc/pcre.txt +++ b/ext/pcre/pcrelib/doc/pcre.txt @@ -1273,6 +1273,8 @@ POSIX CHARACTER CLASSES word "word" characters (same as \w) xdigit hexadecimal digits + >>>>>>>>>>>>Only WORD is perl. BLANK is GNU. + The names "ascii" and "word" are Perl extensions. Another Perl extension is negation, which is indicated by a ^ char- acter after the colon. For example, @@ -1416,7 +1418,6 @@ SUBPATTERNS are numbered 1 and 2. The maximum number of captured sub- strings is 99, and the maximum number of all subpatterns, both capturing and non-capturing, is 200. - As a convenient shorthand, if any option settings are required at the start of a non-capturing subpattern, the option letters may appear between the "?" and the ":". Thus @@ -1468,8 +1469,9 @@ REPETITION matches exactly 8 digits. An opening curly bracket that appears in a position where a quantifier is not allowed, or one that does not match the syntax of a quantifier, is taken - as a literal character. For example, {,6} is not a quantif- - ier, but a literal string of four characters. + as a literal character. For example, {,6} is not a + quantifier, but a literal string of four characters. + The quantifier {0} is permitted, causing the expression to behave as if the previous item and the quantifier were not present. @@ -1519,8 +1521,8 @@ REPETITION does the right thing with the C comments. The meaning of the various quantifiers is not otherwise changed, just the pre- - ferred number of matches. Do not confuse this use of ques- - tion mark with its use as a quantifier in its own right. + ferred number of matches. Do not confuse this use of + question mark with its use as a quantifier in its own right. Because it has two uses, it can sometimes appear doubled, as in @@ -1571,17 +1573,10 @@ REPETITION + BACK REFERENCES Outside a character class, a backslash followed by a digit greater than 0 (and possibly further digits) is a back - - - - -SunOS 5.8 Last change: 30 - - - reference to a capturing subpattern earlier (i.e. to its left) in the pattern, provided there have been that many previous capturing left parentheses. @@ -1630,8 +1625,8 @@ SunOS 5.8 Last change: 30 A back reference that occurs inside the parentheses to which it refers fails when the subpattern is first used, so, for example, (a\1) never matches. However, such references can - be useful inside repeated subpatterns. For example, the pat- - tern + be useful inside repeated subpatterns. For example, the + pattern (a|b\1)+ @@ -2100,12 +2095,11 @@ UTF-8 SUPPORT UTF-8 codes. It does not diagnose invalid UTF-8 strings. If you pass invalid UTF-8 strings to PCRE, the results are undefined. - Running with PCRE_UTF8 set causes these changes in the way PCRE works: - 1. In a pattern, the escape sequence \x{...}, where the - contents of the braces is a string of hexadecimal digits, is + 1. In a pattern, the escape sequence \x{...}, where the con- + tents of the braces is a string of hexadecimal digits, is interpreted as a UTF-8 character whose code number is the given hexadecimal number, for example: \x{1234}. This inserts from one to six literal bytes into the pattern, @@ -2153,7 +2147,6 @@ UTF-8 SUPPORT 9. The character types such as \d and \w do not work correctly with UTF-8 characters. They continue to test a single byte. - 10. Anything not explicitly mentioned here continues to work in bytes rather than in characters. @@ -2310,6 +2303,5 @@ AUTHOR New Museums Site, Cambridge CB2 3QG, England. Phone: +44 1223 334714 - Last updated: 15 August 2001 Copyright (c) 1997-2001 University of Cambridge. |