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hard to know what regexes are due to the "regex is hard" ugh field and what are actual incompetence

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I mean, someone here obviously knew what [^x] was but didn't use it, why

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LW'ian description of ugh fields wiki.lesswrong.com/wiki/Ugh_field (typically for LW, it's about self improvement)

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erratum: what *bad* regexes are due to ugh fields. someone used one but fell short for weird reasons