How to remove characters when input not matches regex in JS

Question

<input id="myInput" onblur="myFunction()">

<script>
    function myFunction() {
      var value= document.getElementById('myInput').value;
      var regexCharacter = /[0-9|,]+/g;
      strFirst = value.replace(regexCharacter, '')
      document.getElementById('myInput').value = strFirst
    }
</script>

I want to replace '' when the input does not match the regex's. My regex just allow input number and comma. My function is replace when input matching, i want to replace when it's not matching. E.g a12,b2a => 12,2 can anyone help me, thanks.

Well is 12,b2a an allowed input, given that it contains letters? — Tim Biegeleisen
– Tim Biegeleisen, Commented Dec 10, 2022 at 8:34

ChalanaN · Accepted Answer · 2022-12-10 08:48:56Z

1

Use /[^0-9|,]+/g as your regex. The ^ mark is used to match any character that's not in range.

Pro tip: You dont have to memorize all these tokens, just use a tool like https://regex101.com/

answered Dec 10, 2022 at 8:48

ChalanaN

4724 silver badges13 bronze badges

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

Comments

mohammad sajjad gholami · Accepted Answer · 2022-12-10 08:54:03Z

0

First of all, your function is not called to check the value with reqex. then yout reqex replace "" when is number not charactors

<input type="text" id="myInput">

<script>
    myInput.addEventListener("input", function (e) {
      var value= document.getElementById('myInput').value;
      strFirst = value.replace(/[^0-9.]/g, '').replace(/(\..*?)\..*/g, '$1')
      document.getElementById('myInput').value = strFirst
    });
</script>

in this code you can write number whith dot whith this reqex

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

answered Dec 10, 2022 at 8:54

mohammad sajjad gholami

1113 bronze badges

Comments

Paul Iştoan · Accepted Answer · 2022-12-10 08:38:52Z

0

I think you should edit your regex to match letters instead of numbers. Like this: /[a-zA-Z|]+/g

answered Dec 10, 2022 at 8:38

Paul Iştoan

611 silver badge4 bronze badges

2 Comments

Henry Over a year ago

i think so that but if you ented another languege, it's not woking. E.g Korean

Paul Iştoan Over a year ago

Sorry, I didn't take that into account. The answer with the ^ mark should do the trick then.

Collectives™ on Stack Overflow

How to remove characters when input not matches regex in JS

3 Answers 3

Comments

Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related