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Adding Unicode character property support to a pattern-matching library initially generated 775K lines of code (heading toward 1.5M), causing IDE crashes and slow startup times. The solution involved abandoning precomputed automata in favor of lazy computation with caching, improving regexp addition speed from 135/second to 4,330/second. The author reflects on whether GenAI tools like Claude could have accelerated the routine parsing and code generation tasks, acknowledging their utility for code while remaining skeptical of broader GenAI hype.

Losing 1½ Million Lines of Go