Java 正则表达式 - 字符类 [a-zA-Z] 匹配

描述

字符类 [a-zA-Z] 匹配 a 到 z 或 A 到 Z 之间的任何字符。

示例

以下示例展示如何使用字符类匹配。

package com.tutorialspoint;

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

public class CharacterClassDemo {
   private static final String REGEX = "[a-zA-Z]";
   private static final String INPUT = "dbcabca124ADCbc";

   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());
      }
   }
}

让我们编译并运行以上程序，它将生成以下结果 −

Match String start(): 0
Match String start(): 1
Match String start(): 2
Match String start(): 3
Match String start(): 4
Match String start(): 5
Match String start(): 6
Match String start(): 10
Match String start(): 11
Match String start(): 12
Match String start(): 13
Match String start(): 14