做郵件的功能的時候難免會碰到郵箱的驗證，接下來我就把郵件的正則記錄下來，方便以後檢視。
Java方式：

public static boolean isEmail(String email){  
        if (null==email || "".equals(email)){
        	return false; 
        }
        String regEx1 = "^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$"; 
        Pattern p = Pattern.compile(regEx1);
        Matcher m = p.matcher(email);
        if(m.matches()){
        	return true;
        }else{
        	return false;
        }
    }
    public static void main(String[] args) {
		String msg = "
 
[email protected]。cmn";
		System.out.println(isEmail(msg));
	}

js方式：

var reg= /^([a-zA-Z0-9_-])[email protected]([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/;
var mail = '[email protected]。cmn';
console.log(reg.test(mail));