使用jquery.validator.addMethod时允许使用破折号的正确正则表达式是什么？

Question

I just can't get this figured out. I'm using jquery.validator.addMethod . Currently I have the following:

jQuery.validator.addMethod("alphanumeric", function(value, element) {
    return this.optional(element) || /^\w+$/i.test(value);
}, "Letters, numbers, and underscores only please");

This allows letters, underscores and numbers. But what I'd need to allow instead of underscore would be a dash ( - ).

I'm very new to regex and I've been trying to figure out this simple problem but I just can't find a way to do it. Any help would be much appreciated.

Answer 1

It's called "dash" try this:

jQuery.validator.addMethod("alphanumeric", function(value, element) {
    return this.optional(element) || /^[a-z0-9\-]+$/i.test(value);
}, "Letters, numbers, and dashes only please");

Answer 2

You could achieve the same result by specifying a pattern rule and message as follows:

 $('form').validate({ rules: { alphanumdash: { required: true, pattern: /^[a-z0-9\\-]+$/ } }, messages: { alphanumdash: { required: 'AlphaNumDash is required', pattern: 'Letters, numbers, and dashes only please' } } }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.13.1/jquery.validate.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.13.1/additional-methods.min.js"></script> <form id="test"> <input type="text" name="alphanumdash" /><br/> <input type="submit" /> </form>