Remove an underscore with Regex in JavaScript

Question

Like the title says, i would like to remove an underscore within a String with a regex. This is what i have:

  function palindrome(str) {

     str = str.toLowerCase().replace(/[^a-zA-Z]/g, '',/\s/g, '',/[0-9]/g,'');  
        if (str.split("").reverse().join("") !== str) {
           return false;
        }
        else {
           return true;
        }
   }
palindrome("eye");

This should work. What is not working? Note: You don't need toLowerCase(). — Tushar
– Tushar, Commented Jan 8, 2016 at 7:12
You need to assign the result str = str.replace... to the variable. — Tushar
– Tushar, Commented Jan 8, 2016 at 7:12
.replace(/[^a-zA-Z]/g, '',/\s/g, '',/[0-9]/g,'') you can't use replace like this. You can chain them .replace(/[^a-zA-Z]/g, '').replace(/\s/g, '').replace(/[0-9]/g,''). In your case you don't need this, you can use str.replace(/_/g, ''); — Tushar
– Tushar, Commented Jan 8, 2016 at 7:16

sdgluck · Accepted Answer · 2016-01-08 08:54:16Z

48

Use .replace(/_/g, "") to remove all underscores or use .replace(/_/g, " ") to replace them with a space.

Here is an example to remove them:

var str = "Yeah_so_many_underscores here";
var newStr = str.replace(/_/g, "");
alert(newStr);

edited Jan 8, 2016 at 8:54

sdgluck

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answered Jan 8, 2016 at 7:15

void

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sdgluck · Accepted Answer · 2016-01-08 08:55:01Z

4

str.replace(/_/g, '');

This should work.

edited Jan 8, 2016 at 8:55

sdgluck

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answered Jan 8, 2016 at 7:15

Gor

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Comments

Ali Zia · Accepted Answer · 2016-01-08 07:21:40Z

3

You can use .replace to achieve this. Use the following code. It will replace all _ with the second parameter. In our case we don't need a second parameter so all _ will be removed.

<script>
var str = "some_sample_text_here.";
var newStr = str.replace(/_/g , "");
alert ('Text without underscores : ' + newStr);
</script>

answered Jan 8, 2016 at 7:21

Ali Zia

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Comments

Rizwan · Accepted Answer · 2019-03-04 19:34:18Z

1

you can remove underscore from response or any string like this: "hello_rizo"

Code:

var rizo="hello_rizo"
console.log('output', e.response.data.message.replace(/(^|_)./g, s => s.slice(-1).toUpperCase()));

output: hellorizo

answered Mar 4, 2019 at 19:34

Rizwan

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