Perl 5 version 26.3 documentation

uc

Perl functions A-Z | Perl functions by category | The 'perlfunc' manpage
  • uc EXPR

  • uc

    Returns an uppercased version of EXPR. This is the internal function implementing the \U escape in double-quoted strings. It does not attempt to do titlecase mapping on initial letters. See ucfirst for that.

    If EXPR is omitted, uses $_ .

    This function behaves the same way under various pragmas, such as in a locale, as lc does.