s#^(\w+)/$1_#$1_# should be s#^(\w+)/\1_#$1_#. $1 does not work in the match string, only in the replace string. You have to use \1 in the match string.

Perl is Huffman encoded by design.

In reply to Re: using an RE to consolidate repeated words by GrandFather
in thread using an RE to consolidate repeated words by jaa

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