Java正则Reluctant量词[X{n}?]匹配.

Relunsant 量词 [X {n}?]恰好与n个匹配。

示例
以下示例显示了Relunsant量词的用法。

package com.zaixian;

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

public class ReluctantQuantifierDemo {
   private static final String REGEX = "T{2}?";
   private static final String INPUT = "abcdTatTTWTTT";

   public static void main(String[] args) {
      // create a pattern
      Pattern  pattern = Pattern.compile(REGEX);

      // get a matcher object
      Matcher matcher = pattern.matcher(INPUT); 

      while(matcher.find()) {
         //Prints the start index of the match.
         System.out.println("Match String start(): "+matcher.start());
      }
   }
}

编译并运行上面的程序，这将产生以下结果 -

Match String start(): 7
Match String start(): 10