How to remove all numbers and all text from string by using javascript replace?

Question

Hot to remove all number and all text from stringby using javascript replace javascript ?

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
    var str = "123aBcD#$%"; 
    var res = str.replace("1-9,a-z,A-Z", "");
    alert(res);
}
</script>

When i tested my code it's not replace.

How can i do that ?

replace takes either a string or regular expression. You've provided a string, so you're trying to match the string literal "1-9,a-z,A-Z". — RobG
– RobG, Commented Jan 14, 2016 at 4:35

Jeremy Rajan · Accepted Answer · 2016-01-14 04:35:03Z

4

You might want to try, regex.

str.replace(/[a-zA-Z0-9]/g, '')

[a-zA-Z0-9] match a single character present in the list below
a-z a single character in the range between a and z (case sensitive)
A-Z a single character in the range between A and Z (case sensitive)
0-9 a single character in the range between 0 and 9
g modifier: global. All matches (don't return on first match)

Or as Rob mentioned (Thanks Rob).

str.replace(/\w/g, '')

will do too.

edited Jan 14, 2016 at 4:35

answered Jan 14, 2016 at 4:23

Jeremy Rajan

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3 Comments

RobG Over a year ago

/\w/g seems a lot shorter. ;-)

user663031 Over a year ago

Yes, but that will also replace underscores. So /[a-z\d]/i could work.

Wiktor Stribiżew Over a year ago

(?!_)\w can be used.

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