简单正则复习

import java.util.*;
import java.util.regex.*;
class Regex 
{
	public static void main(String[] args) 
	{
		
		test3();
	}
	public static void test3(){//邮箱匹配
		String mail = "[e-mail]";
		String regex = "[a-zA-Z0-9_]+@[a-zA-Z0-9_]+\\.[a-zA-Z]{2,3}";
		System.out.println(mail.matches(regex));
	}
	public static void test2(){//ip地址排序
		String ip_str = "10.21.130.111   12.210.15.1  15.12.12.1   152.152.15.151   13.151.15.1";
		ip_str = ip_str.replaceAll("(\\d+)","00$1");//补齐0
		System.out.println(ip_str);

		ip_str = ip_str.replaceAll("0*(\\d{3})","$1");//去掉多余的0
		System.out.println(ip_str);
		//用TreeSet排序。

		String[] ips = {"10.21.130.111","12.210.15.1","15.12.12.1","152.152.15.151","13.151.15.1"};
		
	}
	public static void test1(){//治疗口吃
		String str = "我我我我....我我我...要.要.要要要要..学学学学....学编编编...编编程..程...程程....程程";
		str = str.replaceAll("\\.+","");
		System.out.println(str);
		str = str.replaceAll("(.)\\1+","$1");
		System.out.println(str);

	}
	public static void f4(){//huo qu
		String str = "da jia hao,ming tian bu fang jia!";
		/*
		将正则规则进行对象的封装
		Pattern p = Pattern.compile("a*b");
		通过正则对象的matcher方法与字符创串相关联、获取要对字符串操作的匹配器对象Matcher
		Matcher m = p.matcher("aaaaab");
		通过Matcher匹配器对象的方法对字符串进行操作
		boolean b = m.matches();
		*/
		String regex = "\\b[a-z]{3}\\b";
		Pattern p = Pattern.compile(regex);
		Matcher m = p.matcher(str);
		while(m.find()){
			System.out.print(m.group());System.out.println(m.start()+":"+m.end());
		}
		/*
		jia
		hao
		jia
		*/

	}
	public static void f3(){//ti huan 
		String str = "xiaoqiangttttzhangsanmmmmmzhaoliu";
		str = str.replaceAll("(.)\\1+","$1");
		System.out.println(str);
		String tel = "15700001111";
		tel = tel.replaceAll("(\\d{3})(\\d{4})(\\d{4})","$1****$3");
		System.out.println(tel);//157****1111
	}
	public static void f2(){//fen ge
		String str = "xiaoqiangttttzhangsanmmmmmzhaoliu";
		String[] name = str.split("(.)\\1+");
		for(String s:name){
			System.out.println(s);
		}
	}
	public static void f1(){//pi pei
		String regex = "1[358]\\d{9}";
		String s = "211215121";
		Scanner sc = new Scanner(system.in);
		while((s=sc.nextLine())!=null){
			System.out.println(s.matches(regex));
		}
	}
}

原文地址：https://www.jb51.cc/regex/359040.html