Java MatchResult groupCount()用法及代碼示例

MatchResult Inteface的groupCount()方法用於獲取此匹配器模式中的捕獲組數。此方法返回一個整數值，該整數值是匹配此匹配器時找到的組數。

用法:

public int groupCount()

參數：此方法不帶任何參數。

返回值：此方法返回此匹配器模式中的捕獲組數。

下麵的示例說明MatchResult.groupCount()方法：

示例1:

// Java code to illustrate groupCount() 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 Geeks for For Geeks Geek"; 
  
        // Create a matcher for the input String 
        MatchResult matcher 
            = pattern 
                  .matcher(stringToBeMatched); 
  
        // Get the number of capturing groups 
        // using groupCount() method 
        System.out.println(matcher.groupCount()); 
    } 
}

輸出：

示例2:

// Java code to illustrate groupCount() 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 GF FG FGF"; 
  
        // Create a matcher for the input String 
        MatchResult matcher 
            = pattern 
                  .matcher(stringToBeMatched); 
  
        // Get the number of capturing groups 
        // using groupCount() method 
        System.out.println(matcher.groupCount()); 
    } 
}

輸出：

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

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注：本文由純淨天空篩選整理自Kirti_Mangal大神的英文原創作品 MatchResult groupCount() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。