Remove All Special Characters from a String in JavaScript

Special characters are characters that fall outside the category of letters (A-Z, a-z) and numbers (0-9). If you need to remove it from a string. In this tutorial, we will show you how to remove all special characters from a string in javascript with and without except underscore, spaces, etc.

How to Remove All Special Characters from a String in JavaScript

Here are some approaches to remove or delete all special characters from a string:

• Approach 1: Using Regular Expressions with replace()
• Approach 2: Using replace() with Escape Characters
• Approach 3: Remove all special characters from string javascript using loop

Approach 1: Using Regular Expressions with replace()

The js replace() method allows us to replace substrings that match a specified pattern, with a replacement string.

For example, you can use regular expressions with replace() to remove all special characters from string:

// example string with special characters
let exString = "Hello, World! This is a sample string with #special characters.";

// Use a regular expression to remove all special characters
let specialCharRemoved = exString.replace(/[^a-zA-Z0-9 ]/g, '');

console.log("Original String:", exString);
console.log("special Char Removed String:", specialCharRemoved);

Here is another example, To remove all special characters from a string except underscores in JavaScript, you can change the regular expression [^a-zA-Z0-9_] in the replace() method, like the following:

// example string with special characters
let exampleString = "Hello, _World! This is an example string with @#$% special characters.";

// Use replace() with a regular expression to keep only alphanumeric characters and underscores
let changedString = exampleString.replace(/[^a-zA-Z0-9_]/g, '');

console.log("example String:", exampleString);
console.log("changed String:", changedString);

If you want to remove all special characters from a string except spaces in js, you can change the regular expression [^a-zA-Z0-9\s] in replace(). Here’s an example:

// example string with special characters
let exampleString = "Hello, World! This is an example string with @#$% special characters.";

// Use replace() with a regular expression to keep only alphanumeric characters and spaces
let changedString = exampleString.replace(/[^a-zA-Z0-9\s]/g, '');

console.log("example String:", exampleString);
console.log("changed String:", changedString);

Approach 2: Using replace() with Escape Characters

If there are some special characters that you want to keep in your string while getting removed from others, you can mention those specific characters in the regular expression. This way, only the specified special characters will be kept, and the rest will be removed from the string.

For example, you can use regular expressions with replace() to remove specific special characters only.

// exmple string with special characters
let exampleStr = "Hello, World! This is a sample string with #special characters.";

// Use a regular expression to remove all special characters except spaces and #
let RemoveSelectedChar = exampleStr.replace(/[^\w\s#]/g, '');

console.log("Original String:", exampleStr);
console.log("Remove Some Characters only String:", RemoveSelectedChar);

Approach 3: Remove all special characters from string javascript using loop

This approach involves iterating through each character in the string and creating a new string by removing specified special characters.

For example, you can use a for loop to remove specified special characters from a string.

// Example string with special characters
let exampleString = "Hello, World! This is an example string with @#$% special characters.";

// Iterate through the string and build a new string without special characters
let newString = '';
for (let i = 0; i < exampleString.length; i++) {
    if (exampleString[i].match(/[a-zA-Z0-9]/)) {
        newString += exampleString[i];
    }
}

console.log("Old String:", exampleString);
console.log("New String:", newString);

Conclusion

The flexibility of these approaches allows you to remove special all characters from a string in js with and without special characters.

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