Three remarks

• You didn't need to use $1 etc at all, a regex will return the captures in list context. my @matches = ( $str =~ /pa(tt)ern/g )
• I suppose the trie optimization of alternate numbers directly inside a negative look ahead (?!(0|15|16|31)\D)(\d+) to be a very fast alternative.°
• the AI discussion happened in the context of another meditation, I only referenced it here for completeness.

Happy testing!

°) TIMTOWTDI

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