One recurring table-parsing bug hid as data errors across five tools before a fix landed

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A developer working on a markdown-heavy specification project discovered the same one-line table-parsing bug independently appearing in five separate tools, each time mishandling escaped vertical bars inside table cells. Because the naive split ignored escape characters, table columns shifted silently, causing downstream checks to report false content failures — including two specification definitions appearing unverified. Each previous encounter had been patched in isolation, with no shared record of how many table-reading tools existed across the codebase. The lasting fix was not an improved regex but a mandatory inventory: every tool that parses a table must be declared in a list, and a automated check verifies each against fixtures covering both escaped pipes and a visually identical Unicode lookalike character. The author concludes that a bug recurring more than twice signals a missing inventory, not just a missing patch.

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