I have a sub which converts e.g. 
_________XX_X_XX_________ => 2,1,2
__________XXXXX__________ => 5
____XXXX___XXX__XXXXX____ => 4,3,5

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Spec: output is comma separated list of run lengths of the 'X' parts.

The sub is : 

sub template
{
   my $r = shift;
   $r =~ s/^_+//;
   $r =~ s/_+$//;
   $r =~ s/_+/_/g;
   return join ',', map { length($_) } split(/_/,$r);
}

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Is there a Regex way of doing the last line ?
I'd like to be able to do e.g. 
s/(X+)/length($1)/g;

[download]
But this if course doesn't do what I need.
--
Brovnik

In reply to Replacing string with its length in Regex by Brovnik

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