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| author | Karl Williamson <khw@khw-desktop.(none)> | 2010-07-15 17:28:28 -0600 |
|---|---|---|
| committer | David Golden <dagolden@cpan.org> | 2010-07-17 21:50:48 -0400 |
| commit | f0a2b745ce6c03aec6412d79ce0b782f20eddce4 (patch) | |
| tree | d1786b1a4a80f6b848dca1ab4eba6e3ffd5dc5d1 /pod/perl5133delta.pod | |
| parent | 8e4698ef1ed0da722532bfcc769ba22fe85c4b47 (diff) | |
| download | perl-f0a2b745ce6c03aec6412d79ce0b782f20eddce4.tar.gz | |
Add \o{} escape
This commit adds the new construct \o{} to express a character constant
by its octal ordinal value, along with ancillary tests and
documentation.
A function to handle this is added to util.c, and it is called from the
3 parsing places it could occur. The function is a candidate for
in-lining, though I doubt that it will ever be used frequently.
Diffstat (limited to 'pod/perl5133delta.pod')
| -rw-r--r-- | pod/perl5133delta.pod | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/pod/perl5133delta.pod b/pod/perl5133delta.pod index 476427e025..d4db338fd9 100644 --- a/pod/perl5133delta.pod +++ b/pod/perl5133delta.pod @@ -28,6 +28,17 @@ here, but most should go in the L</Performance Enhancements> section. [ List each enhancement as a =head2 entry ] +=head2 \o{...} + +The escape sequence C<"\o"> in double-quotish contexts is now defined. It +must be followed by braces enclosing an octal number of at least one digit. It +means the character whose ordinal value is that octal number. This construct +allows large octal ordinals beyond the current max of 0777 to be represented. +It also allows you to specify a character in octal which can safely be +concatenated with other regex snippets without danger of changing its meaning, +and one which won't ever be confused with being a backreference to a regex +capture group. See L<perlre/Capture groups> + =head2 C<\N{I<name>}> and C<charnames> enhancements C<\N{}> and C<charnames::vianame> now know about the abbreviated character @@ -84,7 +95,9 @@ anomalous behavior than their use in all other double-quotish contexts. Since all double-quotish contexts have the same behavior, namely to be equivalent to C<\x{100}> - C<\x{1FF}>, with no deprecation warning. Use of these values in the command line option C<"-0"> retains the current meaning to slurp input files -whole; previously, this was documented only for C<"-0777">. +whole; previously, this was documented only for C<"-0777">. It is recommended, +however, because of various ambiguities, to use the new L</\o{...}> construct +to represent characters in octal. =head1 Deprecations |