Java Regex Remove Special Characters

1 year ago
Isabella Edwards
1 minute

To remove special characters using Java regular expressions, follow these steps:

  1. Create a regular expression pattern to match special characters. For example, you can use [^a-zA-Z0-9] to match all characters except letters and numbers.
  2. Utilize the Java regular expression classes Pattern and Matcher for matching and replacing.

Here is a sample code demonstrating how to use Java regular expressions to remove special characters.

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static void main(String[] args) {
        String str = "Hello, #World!$";
        
        // 创建正则表达式模式，匹配除字母和数字之外的所有字符
        Pattern pattern = Pattern.compile("[^a-zA-Z0-9]");
        
        // 创建Matcher对象，用于匹配和替换字符串
        Matcher matcher = pattern.matcher(str);
        
        // 使用空字符串替换特殊字符
        String result = matcher.replaceAll("");
        
        System.out.println("原始字符串：" + str);
        System.out.println("去除特殊字符后的结果：" + result);
    }
}

Running the above code will produce the following output:

原始字符串：Hello, #World!$
去除特殊字符后的结果：HelloWorld

In the above code, a regular expression pattern is created using Pattern.compile(“[^a-zA-Z0-9]”), where [^a-zA-Z0-9] represents all characters except letters and numbers.

Then, use the Matcher.replaceAll(“”) method to replace special characters with an empty string, obtaining the result without special characters.

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