Including a hyphen in a regex character bracket?

Question

$.validator.addMethod(\'AZ09_\', function (value) { 
    return /^[a-zA-Z0-9.-_]+$/.test(value); 
}, \'Only letters, numbers, and _-. are allowed\');

Answer 1

\- should work to escape the - in the character range. Can you quote what you tested when it didn't seem to? Because it seems to work: http://jsbin.com/odita3