Java Matcher end(int)用法及代碼示例

Matcher類的end(int group)方法用於從指定組中獲取已經完成匹配結果的結束索引後的偏移量。

用法:

public int end(int group)

參數：此方法采用一個參數組，從該參數組中需要匹配模式的結束索引之後的偏移量。

返回值：此方法返回從指定組匹配的結束索引之後的偏移量。

異常：該方法拋出：

IllegalStateException如果尚未嘗試匹配，或者先前的匹配操作失敗。
IndexOutOfBoundsException如果模式中沒有給定組的捕獲組。

下麵的示例說明Matcher.end()方法：

示例1:

// Java code to illustrate end() method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Get the regex to be checked 
        String regex = "(G*s)"; 
  
        // 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 current matcher state 
        MatchResult result 
            = matcher.toMatchResult(); 
        System.out.println("Current Matcher: "
                           + result); 
  
        while (matcher.find()) { 
            // Get the last index of match result 
            System.out.println(matcher.end(1)); 
        } 
    } 
}

輸出：

Current Matcher: java.util.regex.Matcher[pattern=(G*s) region=0,13 lastmatch=]
5
13

示例2:

// Java code to illustrate end() method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Get the regex to be checked 
        String regex = "(G*G)"; 
  
        // Create a pattern from regex 
        Pattern pattern 
            = Pattern.compile(regex); 
  
        // Get the String to be matched 
        String stringToBeMatched 
            = "GFG FGF GFG"; 
  
        // Create a matcher for the input String 
        Matcher matcher 
            = pattern 
                  .matcher(stringToBeMatched); 
  
        // Get the current matcher state 
        MatchResult result 
            = matcher.toMatchResult(); 
        System.out.println("Current Matcher: "
                           + result); 
  
        while (matcher.find()) { 
            // Get the last index of match result 
            System.out.println(matcher.end(0)); 
        } 
    } 
}

輸出：

Current Matcher: java.util.regex.Matcher[pattern=(G*G) region=0,11 lastmatch=]
1
3
6
9
11

參考： Oracle Doc

相關用法

注：本文由純淨天空篩選整理自Kirti_Mangal大神的英文原創作品 Matcher end(int) 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。