Java Matcher toString()用法及代碼示例

Matcher類的toString()方法用於獲取此匹配器的String表示形式。此方法派生自Object Class，其行為類似。

用法:

public String toString()

參數：此方法不帶參數。

返回值：此方法返回一個String值，它是此匹配器的String表示形式。

下麵的示例說明Matcher.toString()方法：

示例1:

// Java code to illustrate toString() 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 
            = " Geeks for For Geeks Geek"; 
  
        // Create a matcher for the input String 
        Matcher matcher 
            = pattern.matcher(stringToBeMatched); 
  
        // Get the String representation of this matcher 
        // using toString() method 
        System.out.println(matcher.toString()); 
    } 
}

輸出：

java.util.regex.Matcher[pattern=(Geeks) region=0,25 lastmatch=]

示例2:

// Java code to illustrate toString() 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 
            = "FGF GFG GFG FGF"; 
  
        // Create a matcher for the input String 
        Matcher matcher 
            = pattern.matcher(stringToBeMatched); 
  
        // Get the String representation of this matcher 
        // using toString() method 
        System.out.println(matcher.toString()); 
    } 
}

輸出：

java.util.regex.Matcher[pattern=(GFG) region=0,15 lastmatch=]

參考： https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#toString–

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