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f=(n,s,e)=>s<=e&&`$=>s<=e&&!!`${s++}`.includesmatch(n)+f(n,s,e)
(My best nonrecursive version was 61 bytes.) Edit: Saved 1 byte thanks to @edc65.
f=(n,s,e)=>s<=e&&`${s++}`.includes(n)+f(n,s,e)
(My best nonrecursive version was 61 bytes.)
f=(n,s,e)=>s<=e&&!!`${s++}`.match(n)+f(n,s,e)
