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

Last Updated : 13 Dec, 2019

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.

<!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>

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.

<!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>

Output:

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

My Personal Notes

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