java正则表达式替换案例

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

public class RegexTest {

	public static void main(String[] args) {
		//给字符串s中的a,b,cd字符外层套上标签
		String s = "a123bcdee";
		String regex = "a|b|cd";
		Pattern r = Pattern.compile(regex);
		Matcher m = r.matcher(s);
		StringBuffer sb = new StringBuffer();
		while(m.find()){
	         m.appendReplacement(sb,""+m.group()+"");
	    }
		System.out.println(sb.toString());
	    m.appendTail(sb);
	    System.out.println(sb.toString());
	}

}