If you're at all worried about locale and language issues, or if you're just concerned about doing things the canonical way, you can use $_ = lc $_; instead of tr/A-Z/a-z/; to get a lowercase version. lc and uc are built in, and they honor the current language and localization settings.

In reply to Re^3: 'Simple' comparing a hash with an array by mr_mischief
in thread 'Simple' comparing a hash with an array by Anonymous Monk

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