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Attempt This Online! / Try it online!
s->count(r"(.)\1*+.+\1",s)<1
Attempt This Online!
-2 bytes compared to v0.7+, thanks to MarcMush
->s{!/(.)\1*+.+\1/!~s}
Try it online!Try it online!
->s{!/(.)\1*+.+\1/}
Try it online!
->s{/(.)\1*+.+\1/!~s}
`(.)(?!\1).+\1`NI a+\1`NIa
`(.)(?!\1).+\1`NI a
`(.)(?!\1).+\1`NIa
