Java正则表达式字符反斜杠

package com.codingdict;



import java.util.regex.Matcher;

import java.util.regex.Pattern;



public class CharactersDemo {

   private static final String REGEX = "\\";

   private static final String INPUT = "dbca\\bcabc";



   public static void main(String[] args) {

      // create a pattern

      Pattern pattern = Pattern.compile(Pattern.quote(REGEX));

      // get a matcher object

      Matcher matcher = pattern.matcher(INPUT);



      if(matcher.find()) {

         //Prints the start index of the match.

         System.out.println("Match String start(): "+matcher.start());

      }

   }

}