POSIX 字符类别 \p{Upper} 匹配

描述

字符类别 \p{Upper} 匹配任何大写字符。

示例

以下示例显示了 POSIX 字符类别匹配的用法。

package com.tutorialspoint;

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

public class PosixCharacterClassDemo {
   private static final String REGEX = "\\p{Upper}";
   private static final String INPUT = "dbcaABb12\tc";

   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());
      }
   }
}

让我们编译并运行上述程序，这将产生以下结果 −

Match String start(): 4
Match String start(): 5