The massive processing time is caused by having to run each regex on each line. The best way to cut processing time is to run the regexes on the entire file instead, or at least as large chunks of it as you can manage. Read x number of bytes and then everything to the next line break; perform all regex calls; output to a new file.
This is a case where buying a block or two of additional memory may be the simplest - and most cost-effective - solution.
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