Not all combinations of upper and lower case are valid. 'Perl' is the name of the language. 'perl' is the name of the interpreter. 'PERL' is used in some book titles. (e.g. PERL IN A NUTSHELL). Use alternation to test only for the valid forms. 
last if m/\b(?:PERL|Perl|perl)\b/;

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Bill

In reply to Re: mixed case with match by BillKSmith
in thread mixed case with match by catfish1116

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