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$Test_String = <STDIN> ; if($Test_String =~ /$Regex_Pattern/){ ... } else { print "false"; }
1110110001 => 00111, 10101 7 21 3 * 7 = 21, accept!
use bigint; ... } $Regex_Pattern = qr/(?{ check() })/;
(?(condition)yes-pattern|no-pattern)
$Regex_Pattern = qr/^(?(?{ check() }) ^ | (*FAIL) )/x;
'^(?(?{c()})^|(*F))'
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord }map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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