in reply to One regex construct to handle multiple string types

If you're looking for a single digit followed by a capital letter (this is a wild guess, since you might just be looking for a literal '2L' anywhere in the string - it's rather hard to tell), then this simple regex will do: 

while (<DATA>){
    chomp;
    print "$1\n" if /(\d[A-Z])/;
}

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--
"Language shapes the way we think, and determines what we can think about."
-- B. L. Whorf

In Section Seekers of Perl Wisdom