diff options
Diffstat (limited to 'lib/feature.pm')
| -rw-r--r-- | lib/feature.pm | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/lib/feature.pm b/lib/feature.pm index f8a9078234..c70010df6e 100644 --- a/lib/feature.pm +++ b/lib/feature.pm @@ -105,11 +105,22 @@ See L<perlsub/"Persistent Private Variables"> for details. =head2 the 'unicode_strings' feature -C<use feature 'unicode_strings'> tells the compiler to treat -all strings outside of C<use locale> and C<use bytes> as Unicode. It is -available starting with Perl 5.11.3, but is not fully implemented. - -See L<perlunicode/The "Unicode Bug"> for details. +C<use feature 'unicode_strings'> tells the compiler to use Unicode semantics +in all string operations executed within its scope (unless they are also +within the scope of either C<use locale> or C<use bytes>). The same applies +to all regular expressions compiled within the scope, even if executed outside +it. + +C<no feature 'unicode_strings'> tells the compiler to use the traditional +Perl semantics wherein the native character set semantics is used unless it is +clear to Perl that Unicode is desired. This can lead to some surprises +when the behavior suddenly changes. (See +L<perlunicode/The "Unicode Bug"> for details.) For this reason, if you are +potentially using Unicode in your program, the +C<use feature 'unicode_strings'> subpragma is B<strongly> recommended. + +This subpragma is available starting with Perl 5.11.3, but was not fully +implemented until 5.13.8. =head1 FEATURE BUNDLES |