Build a Regex Engine From Scratch in Python (Thompson NFA, No Backtracking)
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YouTubeCodez Up
Build a Regex Engine From Scratch in Python (Thompson NFA, No Backtracking)
Most regex engines -- including Python's re, JavaScript, Java and PCRE -- match by backtracking, and on certain patterns that means exponential blowup: a few dozen characters can hang for seconds, minutes, or forever. This is ReDoS, and it took down Cloudflare in 2019. In this build we write a regex engine the other way -- the way grep and RE2 ...
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