Java 正则匹配 replacefirst

package com.codingdict;



import java.util.regex.Matcher;

import java.util.regex.Pattern;



public class MatcherDemo {

   private static String REGEX = "dog";

   private static String INPUT = "The dog says meow " + "All dogs say meow.";

   private static String REPLACE = "cat";



   public static void main(String[] args) {

      Pattern pattern = Pattern.compile(REGEX);



      // get a matcher object

      Matcher matcher = pattern.matcher(INPUT); 

      INPUT = matcher.replaceFirst(REPLACE);

      System.out.println(INPUT);

   }

}