CODEWITHSUNDEEP
javascriptregex
kingrichard2005
kingrichard2005

Reputation: 7269

Javascript regular expression syntax error?

I'm trying to evaluate a test string against a regular expression I build from a string extracted from a hidden input element, the code is as follows

HTML
<input type="hidden" name="reg_2" id="reg_2" value="^\\d{5}$">

JS
var regTest = new RegExp( $('#reg_2').val(), 'g' );
var valid = "12345";
var invalid = "47";
alert(regTest.test(valid));<--Returns false

It keeps evaluating to false, I'm not sure if the syntax is wrong or if there's something else I'm missing. I tried with and without the global flag, and I also confirmed that the jQuery selector is returning the correct value. Any help or insight is welcome. Thank you.

UPDATE

Thank you for the prompt responses. I was following the example on the Mozilla Dev Network which shows a hardcoded string in the RegEx constructor with a double backslash and thought that's what I needed to pass to my script. Thanks again.

Upvotes: 1

Views: 2366

Answers (2)

FishBasketGordo
FishBasketGordo

Reputation: 23132

You don't need to escape the backslash. The value of the hidden input should just be "^\d{5}$". Here's a working example.

Upvotes: 1

Just_Mad
Just_Mad

Reputation: 4077

Remove one slash in the input value:

<input type="hidden" name="reg_2" id="reg_2" value="^\d{5}$">

Upvotes: 2

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