Published on: 2025-09-03 23:53:05
The next part of the Advent of Code puzzle involves interpreting instructions called do() and don't() which turn on and off the contributions of mul instructions to the sum. As we parse, we now need to keep track of one bit of state. This is a nightmare for regexes to deal with, because they recognise regular languages, and regular languages are literally stateless languages.2 There’s more nuance, of course, but as a first approximation. Technically regular languages are those that can be recogn
Keywords: bytestring import mul parser state
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