- Plain Strings (207):
foo - Anchors (208):
k$ - Ranges (202):
^[a-f]*$ - Backrefs (201):
(...).*\1 - Abba (169):
^(.(?!(ll|ss|mm|rr|tt|ff|cc|bb)))*$|^n|ef - A man, a plan (177):
^(.)[^p].*\1$ - Prime (286):
^(?!(..+)\1+$) - Four (199):
(.)(.\1){3} - Order (198):
^[^o].....?$ - Triples (507):
(^39|^44)|(^([0369]|([147][0369]*[258])|(([258]|[147][0369]*[147])([0369]*|[258][0369]*[147])([147]|[258][0369]*[258])))*$)
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jpsim
/ answers.md
Last active
November 10, 2025 05:12
Regex Golf Answers (http://regex.alf.nu/)
HN: https://news.ycombinator.com/item?id=6941231