this'll do it 
#!perl -wl

use strict;

$_ = "[ABC AB AB12/83]";
print "I have a string like this\n$_";
s{\[([A-Z_]+)\s([A-Z_]+)\s([A-Z_]+)(\d+)/(\d+)\]}{$1_$2_$3$4_$5};
print "I would like to end up with\n$_";

[download]

perl -e"\$_=qq/nwdd\x7F^n\x7Flm{{llql0}qs\x14/;s/./chr(ord$&^30)/ge;print"

In reply to Re: Substituting in the substitution! by pizza_milkshake
in thread Substituting in the substitution! by Mondongo

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