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Written by Gary "grim" Kramlich on 2025-01-05 at 04:30

They say when you use regex you have two problems. I tend to have one less problem...

Case in point, here's a tokenizer for https://www.rfc-editor.org/rfc/rfc5801.html#section-4.

^(?:(?PF),)?(?P[npy])(?:=(?P[^,]+))?,(?:a=(?P[^,]+))?,

Validation still has to be done in the application, but this is still way easier than writing and maintaining a lexer.

[#]regex #coding #development #rfc

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