space separation under /x flag seems to do the job
DB<113> $_="AAAA"; $c="A"; $min=3; /$c {$min}/x; $&
=> "AAA"
UPDATE
TIMTOWTDI
DB<108> $c="A";$min=3
=> 3
DB<109> "AAAAA" =~ m/${c}{$min}/; $&
=> "AAA"
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