Java中的 Matcher pattern() 方法及示例

Matcher 类的pattern()方法用于获取该匹配器要匹配的模式。

句法：

public Pattern pattern()

参数：此方法不接受任何参数。

返回值：该方法返回一个Pattern ，这是该Matcher要匹配的模式。

下面的示例说明了 Matcher.pattern() 方法：

示例 1：

// Java code to illustrate pattern() method
  
import java.util.regex.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Get the regex to be checked
        String regex = "Geeks";
  
        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);
  
        // Get the String to be matched
        String stringToBeMatched
            = "GeeksForGeeks";
  
        // Create a matcher for the input String
        Matcher matcher
            = pattern.matcher(stringToBeMatched);
  
        // Get the Pattern using pattern() method
        System.out.println("Pattern: "
                           + matcher.pattern());
    }
}

输出：

Pattern: Geeks

示例 2：

// Java code to illustrate pattern() method
  
import java.util.regex.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Get the regex to be checked
        String regex = "GFG";
  
        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);
  
        // Get the String to be matched
        String stringToBeMatched
            = "GFGFGFGFGFGFGFGFGFG";
  
        // Create a matcher for the input String
        Matcher matcher
            = pattern.matcher(stringToBeMatched);
  
        // Get the Pattern using pattern() method
        System.out.println("Pattern: "
                           + matcher.pattern());
    }
}

输出：

Pattern: GFG

参考： Oracle 文档