I don't see any way of modifying the algorithm of the regular expression to make it more comprehensible (maybe doing it in multiple steps?) but, when I want to make code more comprehensible, my first thought is documentation, and regular expressions can certainly take documentation. Utilizing the x
modifier, the regular expression will ignore white space and comments (# delimited). See perlre
. I also think uc
might be more clear than your tr. Consider:
$job_id = uc $job_id;
$job_id =~ s/^(..)(..)(..)(..) # Invert first 4 bytes
(..)(..) # More comments ...
or the indentation/comment scheme of your choice.