在Java中使用正则表达式进行字符串匹配与替换-蒲公英云

在Java中使用正则表达式进行字符串匹配与替换

原创比眉伴天荒 2024-09-27 16:27 128阅读 0赞

在Java中，我们可以使用Pattern和Matcher类来操作正则表达式。下面是一些基本的示例：

字符串匹配：
```java
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RegexMatchExample {
public static void main(String[] args) {
String inputString = “Hello, World!”;
String regexPattern = “\w+”; // \w represents any word character (letters and digits)

    Pattern pattern = Pattern.compile(regexPattern);
    Matcher matcher = pattern.matcher(inputString);
    if (matcher.find()) {
        System.out.println("Found match: " + matcher.group());
    } else {
        System.out.println("No match found.");
    }
}

}


2. 字符串替换：
```java
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexReplaceExample {
    public static void main(String[] args) {
        String inputString = "Hello, World!";
        String regexPattern = "\\w+"; // \w represents any word character (letters and digits)
        String replacementText = "Java rules!";
        Pattern pattern = Pattern.compile(regexPattern);
        Matcher matcher = pattern.matcher(inputString);
        if (matcher.find()) {
            inputString = matcher.replace(replacementText));
            System.out.println("Input string after replace: " + inputString);
        } else {
            System.out.println("No match found to replace.");
        }
    }
}