If you disclose what regexp1 & regexp2 look like -- and how they are derived from $file? Presumably they are not constants, otherwise you would be calculating the same two counts 450 times each -- then it may be possible to see some way of speeding up the processing.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
RIP Neil Armstrong