java中的正则学习

package regex.demo;

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

public class RegexDemo2 {

	public static void main(String[] args) {
		fun4();
	}
	
	//获取
	private static void fun4() {
		String str = "da jia haodf,wo shi";
		//单词边界
		String regex = "\\b[a-z]{3}\\b";
		
		//将正则封装成对象
		Pattern p = Pattern.compile(regex);
		//通过正则获取匹配器
		Matcher m = p.matcher(str);
		//通过Matcher对象
		while(m.find()){
			System.out.println(m.group());//获取匹配的子列
		}
	}

	//匹配手机号码是否正确
	public static void fun() {
		String tel = "18707185910";
//		String reg = "1[358][0-9]{9}";
		String reg = "1[358]\\d{9}";
		//  [0-9]  \d
		System.out.println(tel.matches(reg));
	}
	
	//分割
	public static void fun1() {
		String str = "da.ds.fed";
		//split(String regex)
		String[] names = str.split("\\.");
		
		for(String name : names) {
			System.out.println(name);
		}
	}
	
	/*
	 * ((A)(b(c)))  从左括号算组
	 */
	public static void fun2() {
		String str = "daddddddseeeeefed";
		//直接编号就是组
		String[] names = str.split("(.)\\1+");
		
		for(String name : names) {
			System.out.println(name);
		}
	}
	
	//替代
	public static void fun3() {
		String str = "daddddddseeeeefed";
//		String names = str.replaceAll("(.)\\1+","#");
		
		//多个重叠用一个代替
		String names = str.replaceAll("(.)\\1+","$1");
		System.out.println(names);
		//分组
		String tel = "18707185910"; //187****5910
		tel = tel.replaceAll("(\\d{3})\\d{4}(\\d{4})", "$1****$2");
		System.out.println(tel);		
	}
}