tr replaces characters, while s/// replaces substrings.

Your code in fact removes all characters in the set lmx.()$ from the target string.

Update: Athanasius pointed out that I missed the dollar sign in what tr replaces. The expression given to tr// does not interpolate variables.

In reply to Re: Regex expression is matching more than once by Corion
in thread Regex expression is matching more than once by tobias_hofer

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