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update (Score:1)
Basically, I investigated using re2c/re2xs as a speed-up engine for SpamAssassin, without much luck. The problem is that re2c can only track one regexp's state at a time, so overlapping regexps are handled inconsistently; users calling the code need to know in advance if one regexp is subsumed by another, otherwise the subsumed regexp will never match when the subsumer does. So re2c isn't useful for all use cases...
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