Java Pattern matcher(CharSequence)用法及代码示例

Pattern类的matcher(CharSequence)方法用于生成匹配器，该匹配器将有助于将给定输入作为参数匹配此模式的方法。当我们需要一次根据文本检查一个模式，并且Pattern类的默认设置合适时，Pattern.matches()方法非常有用。

用法:

public Matcher matcher(CharSequence input)

参数：此方法接受单个参数输入，该参数表示要匹配的字符序列。

返回值：此方法为此模式返回一个新的匹配器。

以下示例程序旨在说明matcher(CharSequence)方法：

示例1:

// Java program to demonstrate 
// Pattern.matcher(CharSequence) method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // create a REGEX String 
        String REGEX = "(.*)(ee)(.*)?"; 
  
        // create the string 
        // in which you want to search 
        String actualString 
            = "geeksforgeeks"; 
  
        // create a Pattern 
        Pattern pattern = Pattern.compile(REGEX); 
  
        // get a matcher object 
        Matcher matcher = pattern.matcher(actualString); 
  
        // print values if match found 
        boolean matchfound = false; 
        while (matcher.find()) { 
            System.out.println("found the Regex in text:"
                               + matcher.group() 
                               + " starting index:" + matcher.start() 
                               + " and ending index:"
                               + matcher.end()); 
  
            matchfound = true; 
        } 
        if (!matchfound) { 
            System.out.println("No match found for Regex."); 
        } 
    } 
}

输出：

found the Regex in text:geeksforgeeks starting index:0 and ending index:13

示例2:

// Java program to demonstrate 
// Pattern.matcher(CharSequence) method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // create a REGEX String 
        String REGEX = "(.*)(welcome)(.*)?"; 
  
        // create the string 
        // in which you want to search 
        String actualString 
            = "geeksforgeeks"; 
  
        // create a Pattern 
        Pattern pattern = Pattern.compile(REGEX); 
  
        // get a matcher object 
        Matcher matcher = pattern.matcher(actualString); 
  
        // print values if match found 
        boolean matchfound = false; 
        while (matcher.find()) { 
            System.out.println("match found"); 
            matchfound = true; 
        } 
        if (!matchfound) { 
            System.out.println("No match found"); 
        } 
    } 
}

输出：

No match found

参考文献：
https://docs.oracle.com/javase/10/docs/api/java/util/regex/Pattern.html#matcher(java.lang.CharSequence)

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注：本文由纯净天空筛选整理自AmanSingh2210大神的英文原创作品 Pattern matcher(CharSequence) method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。