Javascript regex allow only number and float

Question

I have below code for replace anything apart from number/ float from a string.

const parseNumbers = strInput => strInput
  .trim()
  .replace(/^[@#$%^&*()_+}{|{}[\]/<>,.;'"`~a-z!]*/gi, '')
  .replace(/[^0-9]+[.][0-9]*/g, "");

The following strings are not working with the above regex:

'644322.abc'

While this works '644322.abc.....' gets converted to 644322

'644322.12ac.....' gets converts to 644322.12

But this does not:

'644322.12ac' gets converted to 644322.12ac

'644322.12-1' remains as is 644322.12-1

I want to replace all characters which are not numbers and keep values as number or float.

Hi i am not here to say something wrong or whatever, just a question, why you replace things unless of checking if they are true? is it user friendly? — DafuQi
– DafuQi, Commented Jul 1, 2021 at 14:58
Good point. Sometimes in data, they have these special characters which need to be discarded. — uday8486
– uday8486, Commented Jul 1, 2021 at 15:09
What is the expected output for 644322.12-1? I suppose 644322.121, right? Or do you only want to keep max 2 fractional digits? — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Jul 1, 2021 at 17:04

Kinglish · Accepted Answer · 2021-07-01 15:09:02Z

4

Can you give an example string? Here is one made up from your question.

let input = "I have below code for replace anything apart from number/ float from a string.The following strings are not working with the above regex:'644322.abc'While this works '644322.abc.....' gets converted to 644322'644322.12ac.....' gets converts to 644322.12But this does not:'644322.12ac' gets converted to 644322.12ac'644322.12-1' remains as is 644322.12-1"

let re = /[+-]?([0-9]*[.])?[0-9]+/g
let m = input.match(re);
console.log(m)

answered Jul 1, 2021 at 15:09

Kinglish

23.7k4 gold badges25 silver badges43 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

uday8486 Over a year ago

It will be just a string of numbers like I added in my post. But I think solution provided by you should work

uday8486 Over a year ago

match function creates a different result than needed. I want to replace characters which do not match the condition. Match function creates different set of output on match.

Wiktor Stribiżew · Accepted Answer · 2021-07-01 17:06:53Z

0

You can remove all chars other than digits and dots first, and then remove all dots other than the first one (unless that first dot is at the end of the string) and use

const texts = ['644322.abc', '644322.12ac.....', '644322.12ac', '644322.12-1'];
texts.forEach( text => console.log(
  text,
  '=>',
  text.replace(/[^\d.]+/g, '').replace(/^([^.]*\.)(?!$)|\./g, '$1')
))

Details:

.replace(/[^\d.]+/g, '') - removes all chars other than digits and dots
.replace(/^([^.]*\.)(?!$)|\./g, '$1') - removes all dots other than the first one that is not at the end of string.

answered Jul 1, 2021 at 17:06

Wiktor Stribiżew

631k41 gold badges502 silver badges633 bronze badges

Collectives™ on Stack Overflow

Javascript regex allow only number and float

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related