Re: [vim/vim] pattern_match(): cache the compiled program of the last pattern (PR #20941)

chrisbra left a comment (vim/vim#20941)

Thanks. The numbers on the big-alternation case are surprising, I didn't expect compilation to dominate that heavily, however that may partly because of the NFA regex engine? Can you run this using the backtracking engine? Still I am a bit hesitant about properly invalidating the cache, when not doing correctly, this could bite us later and would be hard to track down. 

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