in reply to tr/// vs s/// The question.
tr/[^A-Za-z0-9_ ]//d is the same as tr/A-Za-z0-9_ ]^[//d
tr doesn't pay attention to the brackets and treats them as characters.
You'll have better luck with tr/A-Za-z0-9_ //cd
the c stands for complement, d for delete. See perldoc perlops for more info
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