Diagnose a regex bug by moving from symptom to root cause instead of patching blindly.
Pipeline miss A morning batch misses 6 percent of rows after a vendor exporter changed overnight. Adding optional groups can hide the real data change and make tomorrow harder. Five Whys for regex Symptom -> failing example -> boundary -> layer -> system fix Each why must point to evidence: a string, a flag, a source value, or a code path. Guessing does not count. Patch Add ? until the sample passes. The regex changes only when the regex is actually the cause. Every patch should answer a why. 01 Symptom 02 Evidence 03 Now try Name the symptom Why…
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