s/(\w)-(\w)/\1 \2/g has two parts, the first part /(\w)-(\w)/ is the regexp, and the second part /\1 \2/ is just the same as any double quoted string so you have to use $1 and $2 here instead of \1 and \2.

In reply to Re: Regex backreferences by jwkrahn
in thread Regex backreferences by Mad_Mac

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