You could try to feed your strings into Regexp::Assemble. That way you get a single regex you can use to test your lines against, which would probably speed things up. OTOH, you cannot tell wich of your original search strings actually matched the line, if that is important for you. If it is, then you would have to do your explicit tests after the regex matched. Depending on the blank/hit ratio it may still be faster.
Update: as per bibliophile's comment below.
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