Not the cause of your problem but choosing a different regex delimiter can improve readability when split'ing or some other match operation on a slash. This is particularly true when matching *nix paths, e.g.

if ( $path =~ /\/usr\/local\/bin\// ) { ... }
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is much harder to follow than

if ( $path =~ m{/usr/local/bin/} ) { ... }
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I hope this is of interest.