regex string1 (if match write ouput)
regex string2 (if match ...)
regex string3 (if match ...)
regex string4 (if match ...)

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It's usually faster to build one regex with four alternations and match that instead of matching four single regexes against a string.

In reply to Re^2: Optimizing string searches by moritz
in thread Optimizing string searches by cool256

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