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.

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https://perldoc.perl.org/5.22.0/functions/uc.html