Regex to replace everything except numbers and a decimal point

Question

I have a text field that needs to remain only text or decimal. Here is the code that I'm currently using to replace everything except numbers and a decimal point. Issue is, I can't figure out a regex that will identify everything else

document.getElementById(target).value = newVal.replace(/\D[^\.]/g, "");

The \D works fine, but I've tried (?!.), (?!\.), [^.], [^\.] and so on...

Any suggestions for a regular expression that identifies positively with anything except a number or a decimal?

Thanks for the help

in case you're looking to check for actual numbers rather than numeric digits: http://stackoverflow.com/questions/42328875/javascript-regex-to-remove-all-numbers-with-specific-lenght-or-do-a-persistent — cregox, Feb 19 '17 at 15:15

score 314 · Accepted Answer · edited Jan 20 '21 at 16:15

314

Use this:

document.getElementById(target).value = newVal.replace(/[^0-9.]/g, '');

edited Jan 20 '21 at 16:15

John

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answered Dec 31 '10 at 20:34

Chandu

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@Hugo this does not allow anything, you should just not pass a string that could potentially contain more decimal points and pre-process it first. It's like saying string allows every character... – jave.web Dec 03 '16 at 14:20
4

Then run the returned value through parseFloat. That will remove additional decimal points. e.g. `parseFloat("46554.4655465.54654.545345.5") = 46554.4655465` – Simon Dec 06 '16 at 03:57
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This is great to convert already-formatted numbers like money to a computable float. – lu1s Jan 12 '17 at 00:15
2

with `replace(/[^0-9.\-]/g, '')` you will get negative numbers too – Mohsen Jan 25 '21 at 04:31
Moshen, `replace(/[^0-9.\-]/g, '')` is a good start, but allows subtraction formulas, such as -7-8, which will break data systems without server side checking. The regex must only match the first character for negation. I will not post the solution on SO because the last regex question and answer I posted was deleted by Sammitch, who, like the new owners of SO, don't understand how SO works (posting questions and answers together), and don't know the definition of the word blog (it's web-log). So I don't cast my pearls before swine: let the folks who use SO break their data systems. – Jun 21 '21 at 16:35

score 8 · Answer 2 · edited Jun 28 '21 at 05:18

8

Try this:

document.getElementById(target).value = newVal.replace(/^\d+(\.\d{0,2})?$/, "");

edited Jun 28 '21 at 05:18

linktoahref

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answered Mar 05 '14 at 20:21

Beachhouse

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best answer. Removes 0.000 10.000000 .22 2.234, but keeps 1, 10, 10.1, 10.22 – Robert Baker Apr 08 '15 at 17:27
This expression looks complicated, could you explain how it works or what exactly it would remove? – Minderov Jul 03 '16 at 20:27
This doesn't work with cyrillic input such as "5.12 руб." – Minderov Jul 03 '16 at 21:14
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"11111".replace(/^\d+(\.\d{0,2})?$/, "") - result empty string – yAnTar Sep 07 '16 at 17:06

score 8 · Answer 3 · answered May 25 '14 at 22:18

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Removing only decimal part can be done as follows:

number.replace(/(\.\d+)+/,'');

This would convert 13.6667px into 13px (leaving units px untouched).

answered May 25 '14 at 22:18

lubosdz

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Ovi · Answer 4 · 2022-01-13T10:23:17.097

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Regular expression syntax cheatsheet

Go MDN

const str1 = 'hello 123 !@#$%^WORLD?.456_';
const str2 = '৳ $ 20,500.00';

console.log(str1.replace(/[^\d.]/g, "")); //123.456
console.log(str2.replace(/[^\d.]/g, "")); //20500.00

edited Jan 13 '22 at 10:23

answered Jan 13 '22 at 10:00

Ovi

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score 2 · Answer 5 · edited Jun 28 '21 at 05:18

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Check the link Regular Expression Demo

use the below reg exp

[a-z] + [^0-9\s.]+|\.(?!\d)

edited Jun 28 '21 at 05:18

linktoahref

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answered Aug 10 '17 at 14:44

divya

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Camilo Barbosa · Answer 6 · 2022-10-05T23:31:48.057

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Using replace and search to force a decimal number

(text: string )=>{         
     const index = text.search(/(\.)/);                                              
     if (index != text.length -1) {
        let str = text.substring(0, index+1);
        let end = text.substring(index).replace(/[^0-9]/g, '');
        text = str + end;
     }
     return text;
}

edited Oct 05 '22 at 23:31

answered Oct 05 '22 at 23:21

Camilo Barbosa

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score 1 · Answer 7 · answered Feb 06 '23 at 08:59

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If you want to keep comma ',' but be converted as '.' then your users will not have problem using both, then use this:

event.target.value.replace(/[^0-9.,]/g, '').replace(',', '.')

answered Feb 06 '23 at 08:59

Mariusz Sidorowicz

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Regex to replace everything except numbers and a decimal point

7 Answers7

Regular expression syntax cheatsheet

Linked

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