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I first tried a pack / unpack approach, that didn't work and then went to perlman:perlre and read a bit about the zero-width lookbehind operators ... And this is what I came up with :

#!/usr/bin/perl -w use strict; my $Test = ""; print "\n"; # A feeble try with pack/unpack, that dosen't work # print join( ".", unpack( "H2" x 6, pack( "H2" x 6, split( /\./, $Tes +t )))), "\n"; # Now a regex which uses the zero-width lookbehind and works # the "defined $1 ? "0$1" : "" part is ugly, I admit this ... # but I see no other way around it ;-) $Test =~ s/(?(?<![a-f0-9])([a-f0-9]))?\./(defined $1?"0$1":"")/eig; print $Test, "\n";

In reply to Re: One for the regexp fans by Corion
in thread One for the regexp fans by Odud

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