正则表达式

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

public class ZhengZe {

	public static void main(String[] args) {
		//6位数字
		//1.指定正则表达式
		//6位数字
		Pattern p1= Pattern.compile("\\d{6}");
		//11位  以1开头
		Pattern p2= Pattern.compile("1\\d{10}");
		//英文字母和数字组成 长度为4-10
		Pattern p3= Pattern.compile("[a-zA-Z0-9]{4,10}");
		//以英文字母开头和数字组成开头，长度为4-16
		Pattern p4= Pattern.compile("[a-zA-Z][a-zA-Z0-9]{3,15}");
		//2.设置要验证的字符串
		Matcher m1 = p1.matcher("212121");
		Matcher m2 = p2.matcher("11548741547");
		Matcher m3 = p3.matcher("das4");
		Matcher m4 = p4.matcher("dasdad4544");
		//3获得结果
		boolean rs1 = m1.matches();
		boolean rs2 = m2.matches();
		boolean rs3 = m3.matches();
		boolean rs4 = m4.matches();
		System.out.println(rs1);
		System.out.println(rs2);
		System.out.println(rs3);
		System.out.println(rs4);
		

	}

}