Extract the required substring from another string -Perl

Question

I want to extract a substring from a line in Perl. Let me explain giving an example:

fhjgfghjk3456mm   735373653736
icasd 666666666666
111111111111
<         


        

Answer 1

#!/usr/bin/env perl

undef $/;
$text = ;
@res = $text =~ /\b\d{12}\b/g;
print "@res\n";

__DATA__
fhjgfghjk3456mm   735373653736
icasd 666666666666
111111111111