Perl 5 version 22.4 documentation

uc

  • 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 pragma, such as in a locale, as lc does.