# For Perl (language) only # Headers to use use Scalar::Util 'looks_like_number'; # syntax looks_like_number(<your-possible-integer>) # example (copy-paste, and then run the following to see what happens) use Scalar::Util 'looks_like_number'; my $iNum = "123"; if ( looks_like_number($iNum) ) { print "$iNum is a valid integer!" . "\n"; } else { print "$iNum is NOT a valid integer!" . "\n"; }