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this post was submitted on 17 Sep 2026
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Does it do exclusions? Can it merge regexp?
Those would be interesting features, but it currently only operates on plain text lists, or lists with wildcards (*) which are converted into regexp (.*), or lists with CIDR suffixes (127.0.0.0/24). You can disable escaping, but list2regexp doesn't understand the individual segments of regular expressions, so the result will probably be wrong.
With that said, the library being used to handle escaping and testing the generated patterns (regexp2) does expose the syntax tree so the information is available to do interesting things with, such as what you suggest.
Merging probably has more value as people would understand the edge cases, with generated regexp it would be harder for someone to confidently understand the edges without having a deeper understanding of the algorithm and data set.