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Selected Reading
Write a Regular Expression to remove all special characters from a JavaScript String?
To remove all special characters from a JavaScript string, you can use regular expressions with the replace() method. The most common approach is using the pattern /[^\w\s]/g which matches any character that is not a word character or whitespace.
Syntax
string.replace(/[^\w\s]/g, '')
Regular Expression Breakdown
The pattern /[^\w\s]/g works as follows:
-
[^...]- Negated character class (matches anything NOT in the brackets) -
\w- Word characters (a-z, A-Z, 0-9, _) -
\s- Whitespace characters (spaces, tabs, newlines) -
g- Global flag (replace all occurrences)
Example: Basic Special Character Removal
<html>
<head>
<script>
var str = "@!Welcome to our website$$";
document.write("Original: " + str);
// Removing Special Characters
var cleaned = str.replace(/[^\w\s]/g, '');
document.write("<br>Cleaned: " + cleaned);
</script>
</head>
<body>
</body>
</html>
Original: @!Welcome to our website$$ Cleaned: Welcome to our website
Different Approaches
Method 1: Keep Letters, Numbers, and Spaces
<html>
<head>
<script>
var text = "Hello@World! #2023$ Test%";
var result = text.replace(/[^\w\s]/g, '');
document.write("Result: " + result);
</script>
</head>
<body>
</body>
</html>
Result: HelloWorld 2023 Test
Method 2: Keep Only Letters and Spaces
<html>
<head>
<script>
var text = "Hello123@World! #Test%";
var result = text.replace(/[^a-zA-Z\s]/g, '');
document.write("Letters only: " + result);
</script>
</head>
<body>
</body>
</html>
Letters only: HelloWorld Test
Method 3: Remove Spaces Too
<html>
<head>
<script>
var text = "Hello @World! Test";
var result = text.replace(/[^\w]/g, '');
document.write("No spaces: " + result);
</script>
</head>
<body>
</body>
</html>
No spaces: HelloWorldTest
Comparison Table
| Pattern | Keeps | Example Input | Output |
|---|---|---|---|
/[^\w\s]/g |
Letters, numbers, underscores, spaces | "Hello@123 World!" | "Hello123 World" |
/[^a-zA-Z\s]/g |
Only letters and spaces | "Hello@123 World!" | "Hello World" |
/[^\w]/g |
Letters, numbers, underscores | "Hello@123 World!" | "Hello123World" |
Common Use Cases
- Cleaning user input for database storage
- Creating URL-friendly strings
- Sanitizing form data
- Preparing text for search functionality
Conclusion
Use /[^\w\s]/g as the standard pattern to remove special characters while preserving letters, numbers, and spaces. Adjust the pattern based on your specific requirements for what characters to keep.
Updated on: 2026-03-15T23:18:59+05:30
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