Pattern 和 Matcher

package com.jerry.frame.utils;import org.junit.Test;import java.util.regex.Matcher;import java.util.regex.Pattern;/** * Created by zjh on 2017/4/7. */public class TestPattern{    @Test    public void  testPattern(){        Pattern pattern =  Pattern.compile("a");        Matcher matcher = pattern.matcher("abcseas");        System.out.print(matcher.replaceAll("d"));    }}