Regex to remove letters, symbols except numbers

Question

How can you remove letters, symbols such as ∞§¶•ªºº«≥≤÷ but leaving plain numbers 0-9, I want to be able to not allow letters or certain symbols in an input field but to leave numbers only.

Demo.

If you put any symbols like ¡ € # ¢ ∞ § ¶ • ª or else, it still does not remove it from the input field. How do you remove symbols too? The \w modifier does not work either.

Solution 1

You can use \D which means non digits.

var removedText = self.val().replace(/\D+/g, '');

jsFiddle.

You could also use the HTML5 number input.

<input type="number" name="digit" />

jsFiddle.

Solution 2

Use /[^0-9.,]+/ if you want floats.

Solution 3

Simple:

var removedText = self.val().replace(/[^0-9]+/, '');

^ - means NOT

Solution 4

Try the following regex:

var removedText = self.val().replace(/[^0-9]/, '');

This will match every character that is not (^) in the interval 0-9.

Demo.

Solution 5

If you want to keep only numbers then use /[^0-9]+/ instead of /[^a-zA-Z]+/

View more solutions

Comments

[user3167101]

\w is not a modifier but a shortcut of [A-Za-z0-9_] or word characters.

[bezmax]

I hate being 32 seconds late :D

[Darin Dimitrov]

@Max, no problem. Despite this you were the one that got upvoted first :-)

[Doug Harris]

Probably want to replace more than just the first non-digit found -- change regexp to /\D+/

[gnysek]

shouldn't it be /\D+/g ?

[cassi.lup]

/\D+/g has the same effect as to /\D/g.

[user3167101]

If you want a string that could contain a float value ;)

[Pere]

I find the fiddle for number input unuseful: a) it includes the javascript for removing non-numbers and b) if the above js is removed, it does nothing (for me) for the purpose of removing non-numbers

[user3167101]

@Pere You still need to validate it yourself. It does give you the arrows for incrementing/decrementing the number though.

[Joeri]

var removedText = self.val().replace(/[^0-9]+/g, ''); to keep all numbers. albeit 8.10+3 would give 8103... Not sure that is what's asked for in the question.

[tourist]

what is that "," for?

[Klemen Tusar]

@sbk in some regions they use the comma instead of the dot to mark decimal places :)

[Hernán Eche]

also negatives /[^-0-9.,]+/

[Vasiliy Zverev]

.keydown() is not enough if user is allowed to paste text into field.

[letie]

@KlemenTusar I tried this one with "245k" and didn't work..