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NAME

     utf8 - Perl pragma to enable/disable UTF-8 in source code



SYNOPSIS
         use utf8;
         no utf8;




DESCRIPTION
     WARNING: The implementation of Unicode support in Perl is
     incomplete.  See the perlunicode manpage for the exact
     details.

     The `use utf8' pragma tells the Perl parser to allow UTF-8
     in the program text in the current lexical scope.  The `no
     utf8' pragma tells Perl to switch back to treating the
     source text as literal bytes in the current lexical scope.

     This pragma is primarily a compatibility device.  Perl
     versions earlier than 5.6 allowed arbitrary bytes in source
     code, whereas in future we would like to standardize on the
     UTF-8 encoding for source text.  Until UTF-8 becomes the
     default format for source text, this pragma should be used
     to recognize UTF-8 in the source.  When UTF-8 becomes the
     standard source format, this pragma will effectively become
     a no-op.

     Enabling the `utf8' pragma has the following effects:

     o   Bytes in the source text that have their high-bit set
         will be treated as being part of a literal UTF-8
         character.  This includes most literals such as
         identifiers, string constants, constant regular
         expression patterns and package names.

     o   In the absence of inputs marked as UTF-8, regular
         expressions within the scope of this pragma will default
         to using character semantics instead of byte semantics.

             @bytes_or_chars = split //, $data;  # may split to bytes if data
                                                 # $data isn't UTF-8
             {
                 use utf8;                       # force char semantics
                 @chars = split //, $data;       # splits characters
             }




SEE ALSO
     the perlunicode manpage, the bytes manpage









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Created 1996-2024 by Maxim Chirkov

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