#!/usr/bin/ruby
#
## http://rosettacode.org/wiki/Determine_if_a_string_is_numeric
#
func is_numeric(s) {
       (s ~~ /^[+-]?+(?=\.?[0-9])[0-9_]*+(?:\.[0-9_]++)?(?:[Ee](?:[+-]?+[0-9_]+))?\z/) ||
       (s ~~ /^0(?:b[10_]*|x[0-9A-Fa-f_]*|[0-9_]+\b)\z/);
};
var strings = %w(0 0.0 -123 abc 0x10 0xABC 123a -123e3 0.1E-5 50e);
strings.each { |str|
    say ("%9s => %s" % (str, is_numeric(str)));
};