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If string concatenation $ab$ is like left- and right-multiplication, is there any infix (latex) operator notation I can use for checking for contiguous substrings, like $bc \subseteq abcd$? $\subseteq$ doesn't seem right because it's usually about unordered sets.

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    $\begingroup$ Wikipedia lists no standard notation. You can just invent one if you feel the need. Be sure to explain it to the reader. $\endgroup$
    – Yuval Filmus
    Commented Jan 17, 2022 at 6:53

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