before getting into the fix, it's worth putting the quadratic problem in context. with backtracking, a user-supplied pattern and a 50-character input can take longer than the heat death of the universe. it's exponential. Thompson published the NFA construction that avoids it back in 1968. that's nearly 60 years of a solved problem being actively unsolved at scale, because backtracking is still the default in most regex engines. my GitHub security alerts in march 2026 tell the story:
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