You're treating $root_dir as a regex pattern, but I doubt that's what it contains. Use quotemeta (directly or via \Q\E) to convert arbitrary text into a pattern that matches the text. 
s!^\Q$root_dir\E[\\/])!! for @results;

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(Simplified and sped up the pattern by removing needless captures and factoring the common prefix out of the alternation.)

In reply to Re: Can't find Unicode property definition "A" by ikegami
in thread Can't find Unicode property definition "A" by Anonymous Monk

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