The first question should be whether 8 seconds is too long in the first place.
That is indeed the question, because those 8 seconds are for testdata of 724MB, that is: a processing speed of about 100MB/second.
Since the text would appear to be marked up text from a wiki or similar, I doubt the strings would ever be longer than 30kBytes. And then, the task is done in a fraction of a millisecond.
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