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JavaScript | Strip all non-numeric characters from string
  • Last Updated : 30 Apr, 2019

In order to remove all non-numeric characters from a string, replace() function is used.

replace() Function: This functiion searches a string for a specific value, or a RegExp, and returns a new string where the replacement is done.

Syntax:

string.replace( searchVal, newValue )

Parameters: This function accepts two parameters as mentioned above and described below:

  • searchVal: It is required parameter. It specifies the value, or regular expression, that is going to replaced by the new value.
  • newValue: It is required parameter. It specifies the value to be replaced by search value.

Example 1: This example strips the all non-numeric characters from the string ‘1Gee2ksFor345Geeks6’ with the help of RegExp.






<!DOCTYPE html> 
<html
    <head
        <title
            JavaScript | Strip all non-numeric
            characters from string
        </title>
    </head
          
    <body style = "text-align:center;"
      
        <h1 style = "color:green;"
            GeeksForGeeks 
        </h1
          
        <p id = "GFG_UP" style = "color:green; font-size: 20px;"></p>
          
        <button id="GFG_Button" onclick = "stripValues()">
            ClickHere
        </button
          
        <p id = "GFG_P" style = "color:green; font-size: 20px;"></p>
          
        <script>
            var up = document.getElementById("GFG_UP");
            var down = document.getElementById("GFG_P");
            var str = "1Gee2ksFor345Geeks6";
            up.innerHTML = str;
              
            function stripValues() {
                down.innerHTML = str.replace(/\D/g,'');
            }
        </script
    </body
</html>                    

Output:

  • Before clicking on the button:
  • After clicking on the button:

Example 2: This example strips all non-numeric characters from the string ‘1Gee2ksFor345.Gee67ks89’ with the help of RegExp. This example preserves the float numbers.




<!DOCTYPE html> 
<html
    <head
        <title
            JavaScript | Strip all non-numeric
            characters from string
        </title>
    </head
          
    <body style = "text-align:center;"
      
        <h1 style = "color:green;"
            GeeksForGeeks 
        </h1
        <p id = "GFG_UP" style = "color:green; font-size: 20px;"></p>
          
        <button id="GFG_Button" onclick = "stripValues()">
            ClickHere
        </button
          
        <p id = "GFG_P" style = "color:green; font-size: 20px;"></p>
          
        <script>
            var up = document.getElementById("GFG_UP");
            var down = document.getElementById("GFG_P");
            var str = "1Gee2ksFor345.Gee67ks89";
            up.innerHTML = str;
              
            function stripValues() {
                down.innerHTML = str.replace(/[^\d.-]/g, '');
            }
        </script
    </body
</html>                    

Output:

  • Before clicking on the button:
  • After clicking on the button:
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