预定义字符类\W匹配

字符类匹配任何非单词字符。

示例

以下示例显示了预定义字符类匹配的用法。

package com.zaixian;

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

public class PredefinedCharacterClassDemo {
   private static final String REGEX = "\\W";
   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());
      }
   }
}

编译并运行上面的程序，这将产生以下结果 -

Match String start(): 9