http://www.perlmonks.org?node_id=424233


in reply to I wonder...
in thread Things you think you'll never use.

You mean something like: 

$s = "xxyyyyyy";

$s =~ m/((x+)(??{'y' x length($2)}))/ and print "$1\n";

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? :-)

Jenda
We'd like to help you learn to help yourself
Look around you, all you see are sympathetic eyes
Stroll around the grounds until you feel at home
   -- P. Simon in Mrs. Robinson

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Re^2: I wonder...
by spurperl (Priest) on Jan 22, 2005 at 17:26 UTC
    Yes this is exactly what I meant :-) But it's not the point of my post. The point was: this matching task is a real challenge for 'normal regexes'. This technique using ??{} is indeed a way to solve it. I wondered whether there are other ways, using more standard regex operators.
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In Section Meditations