java正则

package cn.stat.p4.ipdemo;

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

public class zhengze {

    /**
     * @param args
     */
    public static void main(String[] args) {
        zzyouxiang();
        zztihuan();
        zzfind();
    }

    //邮箱正则
    private static void zzyouxiang() {
        String s="liuddd@163.com";
        String zz="[0-9a-zA-Z_]+@[0-9a-zA-Z]+(\\.[0-9a-zA-Z]{1,3})+";
        boolean b=s.matches(zz);
        System.out.println(b);

    }

    //正则替换
    private static void zztihuan() {
        //去掉.
        String s="我我我...我我我...我我要要要...要要要要学学.....学学学学什什什什什.....什么么么....么么么么";
        String str=s.replaceAll("\\.+","");
        System.out.println(str);

        //去掉重复
        str=str.replaceAll("(.)\\1+","$1");
        System.out.println(str);
    }

    //正则查找
    private static void zzfind() {
        String ss="qws asfgf kkk,lsdk asdfafe vzcv";
        String s="\\b[a-z]{3}\\b";

        Pattern p=Pattern.compile(s);

        Matcher mt=p.matcher(ss);

        while(mt.find())
        {
        System.out.println(mt.group()+":"+mt.start()+":"+mt.end());
        }
    }

}