As Corion suggests it is hard to offer much by way of constructive advice without something concrete to play with. However, it may be that you can leverage regular expressions in some fashion to speed up the matching phase of the process. I can't provide much more focused advice without some information about the nature of the matching.

True laziness is hard work

In reply to Re^3: how to split huge file reading into multiple threads by GrandFather
in thread how to split huge file reading into multiple threads by sagarika

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