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Remove special characters from a String in Java

Last Updated: June 1, 2024 by Chaitanya Singh | Filed Under: java

In this tutorial, we will learn how to remove special characters from a string in java. For example, if the given string is “Hello @ World” then the output will be “Hello World”.

In order to remove special characters, we can use regex along with the replaceAll() method.

Java Program to remove special characters from a String

public class RemoveSpecialCharacters {
public static void main(String[] args) {
//given string
String input = "Hello! How are you? #Good -morning!";

//calling the user defined method for removing special chars
String result = removeSpecialCharacters(input);
System.out.println("Original: " + input);
System.out.println("After removing special characters: " + result);
}

public static String removeSpecialCharacters(String str) {
// This regular expression matches all special characters
// [^a-zA-Z0-9\\s] matches any character that is not an
// uppercase letter, lowercase letter, digit, or whitespace.
String regex = "[^a-zA-Z0-9\\s]";

// Replace all special characters with an empty string
// Note: There is no space between double quotes
return str.replaceAll(regex, "");
}
}

Output

Original: Hello! How are you? #Good -morning!
After removing special characters: Hello How are you Good morning

Points to Note:

  • You can adjust the regular expression to match specific types of special characters based on your requirements. Refer regex tutorial.
  • If you want to remove whitespace from the string, you can use trim() method. Refer: trim() method and remove whitespace from string.
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Tags: Java-Strings

About the Author

I have 15 years of experience in the IT industry, working with renowned multinational corporations. Additionally, I have dedicated over a decade to teaching, allowing me to refine my skills in delivering information in a simple and easily understandable manner.

– Chaitanya

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