in reply to fourth digit should not match digit "2"
See the answers you (or your cohort) got to Regex for last digit should not be "2" and adapt them. Maybe consider reading your course material, and/or perlre or perlretut.
Read a book on Perl
Written a book on Perl
Contributed to the Perl source code
Debugged someone else's script
Played Perl Golf
Used regular expressions to save the day
Used Perl for a certain amount of time (please specify)
Invested a certain amount of man-hours in learning Perl (please estimate)
Visited at least x Perl related events
(Co)maintain at least x active (up-river) CPAN modules
Forgotten you were not Larry Wall
One can never truly know Perl
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