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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,