Perl 5 version 6.0 documentation

uc

  • uc EXPR
  • uc

    Returns an uppercased version of EXPR. This is the internal function implementing the \U escape in double-quoted strings. Respects current LC_CTYPE locale if use locale in force. See perllocale. Under Unicode (use utf8 ) it uses the standard Unicode uppercase mappings. (It does not attempt to do titlecase mapping on initial letters. See ucfirst for that.)

    If EXPR is omitted, uses $_ .