无涯教程-Java 正则 - Matcher int regionStart函数

java.util.regex.Matcher.regionStart() 匹配器区域的起始索引。

int regionStart() - 声明

public int regionStart()

int regionStart() - 示例

下面的示例显示java.util.regex.Matcher.regionStart()方法的用法。

package com.learnfk;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MatcherDemo {
   private static String REGEX = "(a*b)(foo)";
   private static String INPUT = "aabfooaabfooabfoob";
   private static String REPLACE = "-";
   
   public static void main(String[] args) {
      Pattern pattern = Pattern.compile(REGEX);
      
      //获取匹配器对象
      Matcher matcher = pattern.matcher(INPUT);
      matcher = matcher.region(0, 10);
      
      while(matcher.find()) {
         //在匹配的最后一个字符之后打印偏移量。
         System.out.println("First Capturing Group, (a*b) Match String end(): "+matcher.end());    
      }     
      System.out.println("regionStart(): "+matcher.regionStart());    
   }
}

让无涯教程编译并运行以上程序，这将产生以下输出-

First Capturing Group, (a*b) Match String end(): 6
regionStart(): 0

参考链接

https://www.learnfk.com/javaregex/javaregex-matcher-regionstart.html