Is there some systematic way for finding an unambiguous expression for a binary string which contains a certain substring? For finding expressions not containing a substring, it is sometimes easy to just stare at the problem until you get this concatenation of first, middle, and tail; how to do so for binary string containing some substring (say 11101)?
2026-04-03 05:25:39.1775193939
Unambiguous expression for binary strings containing some substring
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