How to validate textbox in javascript for alphnumeric, hyphen and slash

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I want to validate textbox(Bank Challan number) to enter alphanumeric hyphen and slash only.
Consecutive hyphen or slash not allowed.
Like _/ and /_ and _ _ and // and whitespace not allowed

What I have tried:

JavaScript

re=/^[0-9a-zA-Z/ -]+$/;

                if( $('#<%=txt.ClientID%>').val().match(re))
                {
                    alert("valid");
                    
                }
                else {
  alert("not valid");
                }

Posted 29-Mar-16 23:38pm

Member 7909353

Updated 30-Mar-16 0:36am

v3

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Thomas Daniels · Answer 1 · 2016-03-29T23:46:00

To do the testing against the regex, you can use the test method on RegExp.
RegExp.prototype.test() - JavaScript | MDN[^]

JavaScript

if (re.test($('#<%=txt.ClientID%>').val()))

It's not at all easy to add the rule against consecutive chars in the regex which you already have. Therefore, I propose that you use a second regex: the first regex is to check that it only contains alphanumeric chars, slashes, hyphens and whitespace (you already have this regex), the second regex is to check if there are consecutive slashes and/or hyphens. This regex would look like this:

var re_consecutive_chars = /[/-]{2,}/;

If the textbox value matches this regex, you know that it has consecutive slashes, consecutive hyphens, a slash followed by a hyphen or a hyphen followed by a slash.

I'd also like to say this: I don't know whether you will use the textbox value on the server, but if you do, don't forget to do validation on the server as well. Client-side validation can easily be turned off by users. Server-side validation cannot.