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Diffstat (limited to 'pod/perlretut.pod')
| -rw-r--r-- | pod/perlretut.pod | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/pod/perlretut.pod b/pod/perlretut.pod index 66f8179ab6..87669e50ab 100644 --- a/pod/perlretut.pod +++ b/pod/perlretut.pod @@ -1672,15 +1672,17 @@ i.e., a non-mark followed by one or more marks. As if all those classes weren't enough, Perl also defines POSIX style character classes. These have the form C<[:name:]>, with C<name> the -name of the POSIX class. The POSIX classes are alpha, alnum, ascii, -cntrl, digit, graph, lower, print, punct, space, upper, word, and -xdigit. If C<utf8> is being used, then these classes are defined the -same as their corresponding perl Unicode classes: C<[:upper:]> is the -same as C<\p{IsUpper}>, etc. The POSIX character classes, however, -don't require using C<utf8>. The C<[:digit:]>, C<[:word:]>, and +name of the POSIX class. The POSIX classes are C<alpha>, C<alnum>, +C<ascii>, C<cntrl>, C<digit>, C<graph>, C<lower>, C<print>, C<punct>, +C<space>, C<upper>, and C<xdigit>, and two extensions, C<word> (a Perl +extension to match C<\w>), and C<blank> (a GNU extension). If C<utf8> +is being used, then these classes are defined the same as their +corresponding perl Unicode classes: C<[:upper:]> is the same as +C<\p{IsUpper}>, etc. The POSIX character classes, however, don't +require using C<utf8>. The C<[:digit:]>, C<[:word:]>, and C<[:space:]> correspond to the familiar C<\d>, C<\w>, and C<\s> -character classes. To negate a POSIX class, put a C<^> in front of the -name, so that, e.g., C<[:^digit:]> corresponds to C<\D> and under +character classes. To negate a POSIX class, put a C<^> in front of +the name, so that, e.g., C<[:^digit:]> corresponds to C<\D> and under C<utf8>, C<\P{IsDigit}>. The Unicode and POSIX character classes can be used just like C<\d>, both inside and outside of character classes: |