正则表达式1

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

public class RegexDemo {

    public static void main(String[] args) {
        method_8();
    }

    /*
     * 需求：定义一个功能对QQ号进行校验。 要求：长度5~15. 只能是数字， 0不能开头
     */
    public static void method_1() {
        String qq = "101885";
        String regex = "[1-9]\\d{4,14}";
        System.out.println(qq + ":" + qq.matches(regex));
    }

    /*
     * 需求：手机号码验证
     */
    public static void method_2() {
        String tel = "18190029004";
        String regex = "1[358]\\d{9}";
        System.out.println(tel + ":" + tel.matches(regex));
    }

    /*
     * 需求：叠词切割
     */
    public static void method_3() {
        String str = "akjdhkahjjauuuuqjhadwww;k";
        String regex = "(.)\\1+";
        String[] arr = str.split(regex);
        for (String s : arr) {
            System.out.println(s);
        }
    }

    /*
     * 需求：替换 1.手机号部分替换 2.叠词替换
     */
    public static void method_4() {
        String tel = "13840056789";
        String regex = "(\\d{3})(\\d{4})(\\d{4})";
        System.out.println(tel.replaceAll(regex, "$1****$3"));

        String str = "akjdhkahjjauuuuqjhadwww;k";
        String reg = "(.)\\1+";
        System.out.println(str.replaceAll(reg, "*"));
    }

    /*
     * 需求：获取 三个字母的单词
     */
    public static void method_5() {
        String str = "ajkdh iqw iqiw qii,wip aido q qw";
        String regex = "\\b[a-z]{3}\\b";
        Pattern p = Pattern.compile(regex);
        Matcher m = p.matcher(str);
        while (m.find()) {
            System.out.println(m.group());
            System.out.println(m.start() + " " + m.end());
        }
    }
    /*
     * 热热热.热播..播播..播播播.播电电..电影影电电电.电电.视视视..剧
     * 热播电影电视剧
     */
    
    public static void method_6(){
        String str = "热热热.热播..播播..播播播.播电电..电影影电电电.电电.视视视..剧";
        String regex = "\\.+";
        String str1 = str.replaceAll(regex, "");
        String regex1= "(.)\\1+";
        System.out.println(str1.replaceAll(regex1, "$1"));
    }
    
    /*
     * 对IP地址排序
     * 
     */
    
    public static void method_7(){
        String str = "192.168.2.3   8.8.8.8 127.0.0.1 10.10.10.1";
        //加0
        String regex = "(\\d+)";
        str = str.replaceAll(regex, "00$1");
        //去0
        String reg = "0+(\\d{3})";
        str = str.replaceAll(reg, "$1");
        //排序;
        TreeSet ts = new TreeSet();
        String[] arr = str.split(" +");
        for(String s:arr){
            ts.add(s);
        }
        //格式化输出
        for(Iterator it = ts.iterator();it.hasNext();){
            String ip = (String) it.next();
            String re = "0+(\\d{1,3})";
            ip = ip.replaceAll(re, "$1");
            System.out.println(ip);
        }
    }
    /*
     * Email 验证
     * 
     */
    public static void method_8(){
        String str = "a@163.com";
        String regex = "[a-zA-Z\\d_]+@[a-zA-Z\\d_]+\\.[a-zA-Z]{2,3}";
        System.out.println(str.matches(regex));
    }
}