How to remove all Non-ASCII characters from the string using JavaScript ?

Given a string containing some Non-ASCII characters and the task is to remove all Non-ASCII characters from the given string. There are two methods to solve this problem which are discussed below:

Approach 1:

  • This approach uses a Regular Expression to remove the Non-ASCII characters from the string.
  • Only characters that has value from zero to 127 are valid. (0x7F is 127 in hex).
  • Use .replace() method to replace the Non-ASCII characters with the empty string.

Example: This example implements the above approach.

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<!DOCTYPE HTML> 
<html> 
  
<head> 
    <title> 
        How to remove all Non-ASCII characters
        from the string using JavaScript ?
    </title>
</head> 
  
<body style = "text-align:center;"> 
      
    <h1 style = "color:green;" > 
        GeeksForGeeks 
    </h1>
      
    <p id = "GFG_UP" style =
        "font-size: 15px; font-weight: bold;">
    </p>
      
    <button onclick = "gfg_Run()"> 
        Click Here
    </button>
      
    <p id = "GFG_DOWN" style = "color:green;
        font-size: 20px; font-weight: bold;">
    </p>
      
    <script>
        var el_up = document.getElementById("GFG_UP");
        var el_down = document.getElementById("GFG_DOWN");
        var str="Hidd©©©en??Ascii ©©®®®Charac££ter";
          
        el_up.innerHTML = "Click on the button to remove"
                + " the all Non-ASCII characters from the"
                + " given string.<br>Str = '" + str + "'";
          
        function gfg_Run() {
            str = str.replace(/[^\x00-\x7F]/g, "");
            el_down.innerHTML = str;
        } 
    </script> 
</body> 
  
</html>

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Output:


    

  • Before clicking the button:
    

    • 

  • After clicking the button:
    

    • 



Approach 2:




    

  • This approach uses a Regular Expression to remove the Non-ASCII characters from the string like the previous example.
    • 

  • It specifies the Unicode for the characters to remove. The range of characters between (0080 – FFFF) are removed.
    • 

  • Use .replace() method to replace the Non-ASCII characters with the empty string.
    • 



Example: This example implements the above approach.











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                                    close




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                                    link

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                                    code
                                




















<!DOCTYPE HTML>  


<html>  


  


<head>  


    <title>  


        How to remove all Non-ASCII characters 


        from the string using JavaScript ? 


    </title> 


</head>  


  


<body style = "text-align:center;">  


      


    <h1 style = "color:green;" >  


        GeeksForGeeks  


    </h1> 


      


    <p id = "GFG_UP" style = 


        "font-size: 15px; font-weight: bold;"> 


    </p> 


      


    <button onclick = "gfg_Run()">  


        Click Here 


    </button> 


      


    <p id = "GFG_DOWN" style = "color:green;  


        font-size: 20px; font-weight: bold;"> 


    </p> 


      


    <script> 


        var el_up = document.getElementById("GFG_UP"); 


        var el_down = document.getElementById("GFG_DOWN"); 


        var str="Hidd©©©en??Ascii ©©®®®Charac££ter"; 


      


        el_up.innerHTML = "Click on the button to remove" 


                + " the all Non-ASCII characters from the" 


                + " given string.<br>Str = '" + str + "'"; 


      


        function gfg_Run() { 


            str = str.replace(/[\u{0080}-\u{FFFF}]/gu, ""); 


            el_down.innerHTML = str; 


        }  


    </script>  


</body>  


  


</html> 



















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Output:


    

  • 
Before clicking on the button:
    


    • 

  • 
After clicking on the button:
    


    • 



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