Do you know for sure about the form of each line? For instance, does each line ALWAYS have "allow", "deny", and "password"? If so, maybe doing something like this would help:

my($allow, $deny, $password) = split /allow:|deny:|password:/, $line;
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Otherwise, I'm not sure how you'd go about this other than doing a more manual parser, where you look at each word and try and figure out which section it belongs to.

Update: Screw what I said! jj808's solution looks mighty tasty. ~CubicSpline
"No one tosses a Dwarf!"