diff options
| -rw-r--r-- | pod/perlrecharclass.pod | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/pod/perlrecharclass.pod b/pod/perlrecharclass.pod index ee033634e8..b5f621bb0f 100644 --- a/pod/perlrecharclass.pod +++ b/pod/perlrecharclass.pod @@ -29,7 +29,7 @@ the most well-known character class. By default, a dot matches any character, except for the newline. That default can be changed to add matching the newline by using the I<single line> modifier: either for the entire regular expression with the C</s> modifier, or -locally with C<(?s)>. (The C<\N> backslash sequence, described +locally with C<(?s)>. (The C<L</\N>> backslash sequence, described below, matches any character except newline without regard to the I<single line> modifier.) @@ -93,10 +93,12 @@ If the C</a> regular expression modifier is in effect, it matches [0-9]. Otherwise, it matches anything that is matched by C<\p{Digit}>, which includes [0-9]. (An unlikely possible exception is that under locale matching rules, the -current locale might not have [0-9] matched by C<\d>, and/or might match -other characters whose code point is less than 256. Such a locale -definition would be in violation of the C language standard, but Perl -doesn't currently assume anything in regard to this.) +current locale might not have C<[0-9]> matched by C<\d>, and/or might match +other characters whose code point is less than 256. The only such locale +definitions that are legal would be to match C<[0-9]> plus another set of +10 consecutive digit characters; anything else would be in violation of +the C language standard, but Perl doesn't currently assume anything in +regard to this.) What this means is that unless the C</a> modifier is in effect C<\d> not only matches the digits '0' - '9', but also Arabic, Devanagari, and @@ -647,7 +649,7 @@ X<character class> X<\p> X<\p{}> X<alpha> X<alnum> X<ascii> X<blank> X<cntrl> X<digit> X<graph> X<lower> X<print> X<punct> X<space> X<upper> X<word> X<xdigit> -POSIX character classes have the form C<[:class:]>, where I<class> is +POSIX character classes have the form C<[:class:]>, where I<class> is the name, and the C<[:> and C<:]> delimiters. POSIX character classes only appear I<inside> bracketed character classes, and are a convenient and descriptive way of listing a group of characters. @@ -662,6 +664,7 @@ Be careful about the syntax, The latter pattern would be a character class consisting of a colon, and the letters C<a>, C<l>, C<p> and C<h>. + POSIX character classes can be part of a larger bracketed character class. For example, @@ -779,8 +782,7 @@ Same for the two ASCII-only range forms. There are various other synonyms that can be used besides the names listed in the table. For example, C<\p{PosixAlpha}> can be written as C<\p{Alpha}>. All are listed in -L<perluniprops/Properties accessible through \p{} and \P{}>, -plus all characters matched by each ASCII-range property. +L<perluniprops/Properties accessible through \p{} and \P{}>. Both the C<\p> counterparts always assume Unicode rules are in effect. On ASCII platforms, this means they assume that the code points from 128 @@ -904,7 +906,7 @@ We can extend the example above: This matches digits that are in either the Thai or Laotian scripts. Notice the white space in these examples. This construct always has -the C<E<sol>x> modifier turned on. +the C<E<sol>x> modifier turned on within it. The available binary operators are: |