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.

`\w` is not a modifier but a shortcut of `[A-Za-z0-9_]` or *word characters*. — alex, Jul 11 '11 at 11:31

alex · Accepted Answer · 2015-04-08T00:54:44.473

143

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.

edited Apr 08 '15 at 00:54

answered Jul 11 '11 at 11:23

alex

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Probably want to replace more than just the first non-digit found -- change regexp to `/\D+/` – Doug Harris Jan 12 '12 at 19:52
9

shouldn't it be `/\D+/g` ? – gnysek May 05 '14 at 14:08
1

`/\D+/g` has the same effect as to `/\D/g`. – cassi.lup Jun 17 '14 at 12:38
1

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 – Pere May 04 '15 at 07:56
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@Pere You still need to validate it yourself. It does give you the arrows for incrementing/decrementing the number though. – alex May 05 '15 at 02:21
.keydown() is not enough if user is allowed to paste text into field. – Vasiliy Zverev Nov 23 '20 at 20:32

score 43 · Answer 2 · answered Apr 11 '12 at 18:39

43

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

answered Apr 11 '12 at 18:39

Klemen Tusar

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If you want a string that could contain a float value ;) – alex Apr 08 '15 at 00:55
what is that "," for? – tourist Apr 10 '18 at 15:13
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@sbk in some regions they use the comma instead of the dot to mark decimal places :) – Klemen Tusar Sep 28 '18 at 12:56
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also negatives /[^-0-9.,]+/ – Hernán Eche May 24 '19 at 19:15
@KlemenTusar I tried this one with "245k" and didn't work.. – letie Jun 29 '21 at 18:36

score 22 · Answer 3 · answered Jul 11 '11 at 11:22

22

Simple:

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

^ - means NOT

answered Jul 11 '11 at 11:22

bezmax

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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. – Joeri Feb 05 '17 at 10:24

score 7 · Answer 4 · answered Jul 11 '11 at 11:21

7

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.

answered Jul 11 '11 at 11:21

Darin Dimitrov

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I hate being 32 seconds late :D – bezmax Jul 11 '11 at 11:23

score 4 · Answer 5 · answered Jul 11 '11 at 11:23

4

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

answered Jul 11 '11 at 11:23

Aziz Shaikh

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score 0 · Answer 6 · edited Oct 31 '22 at 07:18

Excluding special characters:

/^[^@~!@#$%^&()_=+\';:"/?>.<,-]$/`

This regular expression helps to exclude special characters from the input.

Exclude special characters and emojis:

/^([^\u2700-\u27BF\uE000-\uF8FF\uDD10-\uDDFF\u2011-\u26FF\uDC00-\uDFFF\uDC00-\uDFFF\u005D\u007C@~!@#$%^&()_=+[{}"\';:"/?>.<,-\s])$/`

This is a regular expression to exclude both special characters and emojis from the input. Given are the Unicode ranges of the emojis, mathematical symbols, and symbols in other languages.

Regex to remove letters, symbols except numbers

6 Answers6

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