I have a string that allows only numbers

$(this).val($(this).val().replace(/([a-zA-Z])/g, ""));

How can I add a space, so this will get replaced with "" same way in one string?

I have a string that allows only numbers

$(this).val($(this).val().replace(/([a-zA-Z])/g, ""));

How can I add a space, so this will get replaced with "" same way in one string?

• javascript
• jquery
• replace

• try this... stackoverflow./questions/181356/… – asharajay Commented Sep 25, 2013 at 8:37
• where do you want to add space exactly? – Mehmed Commented Sep 25, 2013 at 8:38
• possible duplicate of How to allow only numeric (0-9) in HTML inputbox using jQuery? – Ram Commented Sep 25, 2013 at 8:38

3 Answers 3

To match only non-numerics, you would do [^0-9] instead of [a-zA-Z] (this is called a negated character class).

If you want an input to allow only numbers, with HTML5 you can simply do <input type="number">. For wider support, there are plenty of JavaScript solutions, have a look at How to allow only numeric (0-9) in HTML inputbox using jQuery? as suggested in the ments.

Just add the space to your Regex:

  "asfasd asdf asdf".replace(/([a-zA-Z ])/g, "");

Yields:

  ""

Edit: I misunderstood your question. If you want to prevent every input but numbers use this regex:

function removeNotAllowedChars($input) {
   $input.val($input.val().replace(/[^0-9]/g, ''));
}

$('#myText')
   .keyup(function() {
     var $input = $(this);
     removeNotAllowedChars($input);
   })
   .change(function() {
     var $input = $(this);
     removeNotAllowedChars($input);
   });

Using these script removes the input instantly if the user types the character and if he pastes the input after the focus changes. Try it here: JSFiddle

use \s - Matches a single white space character, including space, tab, form feed, line feed. Equivalent to

Regex Guide