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| author | Karl Williamson <public@khwilliamson.com> | 2011-10-27 10:18:34 -0600 |
|---|---|---|
| committer | Karl Williamson <public@khwilliamson.com> | 2011-10-27 10:56:06 -0600 |
| commit | 1978b668ca7817baf02fb20a49327ab82da3bcd4 (patch) | |
| tree | f5cc50443a699b835bf2f950b668f5d150654e5c /pod/perlrebackslash.pod | |
| parent | 4f03b4b68c373d6b483f2a44808498ec2c2bf9f7 (diff) | |
| download | perl-1978b668ca7817baf02fb20a49327ab82da3bcd4.tar.gz | |
PATCH: [perl #99928] Document that is not a bug
After consulting with Tom Christiansen, we decided that this is not a
bug. The CR-LF sequence is considered a unit by Unicode, and so should
be inseperable, even when separating the two would cause a pattern to
match that otherwise fails.
Diffstat (limited to 'pod/perlrebackslash.pod')
| -rw-r--r-- | pod/perlrebackslash.pod | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/pod/perlrebackslash.pod b/pod/perlrebackslash.pod index 0ce42b4515..1a64849e21 100644 --- a/pod/perlrebackslash.pod +++ b/pod/perlrebackslash.pod @@ -603,7 +603,14 @@ linebreak sequence by Unicode. This includes all characters matched by C<\v> (vertical whitespace), and the multi character sequence C<"\x0D\x0A"> (carriage return followed by a line feed, sometimes called the network newline; it's the end of line sequence used in Microsoft text files opened -in binary mode). C<\R> is equivalent to C<< (?>\x0D\x0A|\v) >>. Since +in binary mode). C<\R> is equivalent to C<< (?>\x0D\x0A|\v) >>. (The +reason it doesn't backtrack is because the sequence is considered +inseperable. That means that + + "\x0D\x0A" =~ /^\R\x0A$/ # No match + +fails, because the C<\R> matches the entire string, and won't backtrack +to match just the C<"\x0D">.) Since C<\R> can match a sequence of more than one character, it cannot be put inside a bracketed character class; C</[\R]/> is an error; use C<\v> instead. C<\R> was introduced in perl 5.10.0. |