I think it's generally better to do this with the lc operator rather than tr since lc handles localisation character sets

Only if "use locale" is in effect. Otherwise the following is unlikely to do anything:     print uc 'ü';

This assertion also depends on what the "general" case is considered to be. The general case is probably a single character set so a transliteration, as shown by rob_au, is probably sufficient.

--
John.

In reply to Re: Re: Re: Regexes for Case Change by jmcnamara
in thread Regexes for Case Change by arunhorne

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