Javascript Regex Zipcode for validation

Question

I use the following regular expression to validate a 5 digit zip code. But that does not work.

var zipcode_regex = /[\d]{5,5}/; if (zipcode_regex.test($.trim($('#zipcode').val())) == false) alert('invalid zipcode'); 

I also use jQuery in the code snippet.

Please, help..

Answer 1

Your regular expression also matches if there is a five-digit substring in your line. If you want to check "just five digits, nothing more", you need to anchor your regular expression:

 var zipcode_regex = /^\d{5}$/; if (zipcode_regex.test($.trim($('#zipcode').val())) == false) alert('invalid zipcode'); 

And you can get it easier:

 if (!(/^\s*\d{5}\s*$/.test($('#zipcode').val()))) { alert('invalid zipcode'); } 

Answer 2

Just use /^\d{5}$/ .

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