On the replacement side, that isn't a regex, that's a double-quoted string, and you should be using $1 instead of \1. So, in this case, a simple ${1} will work.

-- Randal L. Schwartz, Perl hacker
Be sure to read my standard disclaimer if this is a reply.

In reply to •Re: In substituation regex, how to differentiate \1 from surrounding text by merlyn
in thread In substituation regex, how to differentiate \1 from surrounding text by kr123

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