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
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