$Test_String = <STDIN> ;
if($Test_String =~ /$Regex_Pattern/){
    print "true";
} else {
    print "false";
}


##</code><code>##

1110110001 => 00111, 10101
                  7     21
              3 * 7  =  21, accept!


##</code><code>##

use bigint;

sub check {
	my ($bin, $three) = ('0b') x 2;
	my $s = $_;
	while ($s) {
		$three .= chop $s;
		$bin   .= chop $s;
	}
	return oct $three == 3 * oct $bin
}

$Regex_Pattern = qr/(?{ check() })/;


##</code><code>##

(?(condition)yes-pattern|no-pattern)


##</code><code>##

$Regex_Pattern = qr/^(?(?{ check() }) ^ | (*FAIL) )/x;


##</code><code>##

'^(?(?{c()})^|(*F))'


##</code><code>##

($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,