Another option when using regex would be to use the lookahead[0] operator (as lo... | Hacker News

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torbencarstens on Dec 1, 2023 | parent | context | favorite | on: Advent of Code 2023 is nigh

Another option when using regex would be to use the lookahead[0] operator (as long as supported, which is the case for the python re module)

  (?=(one|two|three|[...]))

would return `["two", "one"]` for the input string `twone` since the lookahead operator doesn't consume the next character.

[0] https://www.regular-expressions.info/lookaround.html

Huppie on Dec 1, 2023 [–]

Another trick is you can put some regex engines in right-to-left mode, so my lazy (and admittedly relatively expensive cpu-wise) solution was to match ltr for first and rtl for last.

dumbo-octopus on Dec 1, 2023 | [–]

Or just tack a greedy anything-matcher to the front of the regex: .*(?: ... )

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