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c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le "my $rx_vowel = qr{ [aeiouAEIOU] }xms; ... dd \@captures; " ["did", "cop", "get", "his", "cap", "run"]
c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le "my $vowel = 'aeiouAEIOU'; ... dd \@captures; " ["did", "cop", "get", "his", "cap", "run"]