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Almost.
m{ (\d+) # \1 start -- digits -- \1 end (?: , # , ( # \2 start (??{$++1}) # evaluate '$+ + 1' as a regex )+ # \2 end (and try again) ) }
The $+ refers to the last successful captured pattern, and that capture must have been closed. So the first time the (??{...}) is reached, $+ is $1's value. The next time, it's $2's (first) value, and then $2's new value, and so on.

japhy -- Perl and Regex Hacker

In reply to Re: Re: List-to-Range generation by japhy
in thread List-to-Range generation by japhy

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