You are viewing the version of this documentation from Perl 5.24.0. View the latest version
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.