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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
RRP £29.95 ($39.95)

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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 for that.

If EXPR is omitted, uses $_.

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

ISBN 9781906966027Perl Language Reference ManualSee the print edition