电子邮件验证php [英] Email Validation php

问题描述

基本上，我需要使用包含确切字母的电子邮件来验证它.可以说我的大学有一个ID为[e-mail]的学生，我希望验证通过强制该学生在电子邮件开头输入x，然后输入学生证的8个随机数字，最后进行验证需要@ student.ncirl.ie.否则，不允许学生注册并登录该网站.

Basicly i need to validate the email with it containing exact letters. Lets say my college has a student with id [e-mail] , i want the validation to force the student to enter x at the start of the email, then 8 random numbers of their student card and for last to have the validation requiring @student.ncirl.ie. Other wise not allowing the students to register and login into the website.

我的代码是:

 if ( !filter_var($email,FILTER_VALIDATE_EMAIL) ) {
        $error = true;
        $emailError = "Please enter valid email address.";
    } else {
        // check email exist or not
        $query = "SELECT userEmail FROM users WHERE userEmail='$email'";
        $result = mysql_query($query);
        $count = mysql_num_rows($result);
        if($count!=0){
            $error = true;
            $emailError = "Provided Email is already in use.";
        }
    }

我当时想这样做: \ b [x0-9 ._％+-] + @ student.ncirl.ie \ b ，但我只是php的初学者，而我不是能够实现它.如果有人可以，您能否通过创建示例代码来帮助我?或简短说明.谢谢.

I was thinking to do it this way: \b[x0-9._%+-][e-mail]\b but im just a beginner in php and im not able to implement it. If anyone would be able, could u give me a hand by creating a sample code ? Or a brief description. Thank you.

推荐答案

您必须深入研究 preg_match()函数.

搜索主题以匹配pattern中给定的正则表达式.

Searches subject for a match to the regular expression given in pattern.

例如:

$email = "[e-mail]";
$result = preg_match('/^x[\d]{8}@student\.ncirl\.ie$/', $email);

if ($result) {
    ...
    do some stuff
    ...
}

在 regex101 上对正则表达式的测试.

The test of the regular expression on regex101.

说明:

^ 在字符串开头声明位置

x 从字面上匹配字符x(区分大小写)

x matches the character x literally (case sensitive)

匹配以下列表中出现的单个字符:

Match a single character present in the list below :

[\ d] {8}

{8} 量词-精确匹配8次

\ d 匹配一个数字(等于[0-9])

\d matches a digit (equal to [0-9])

@student 逐字匹配字符@student(区分大小写)

@student matches the characters @student literally (case sensitive)

.与字符匹配.从字面上看(区分大小写)

. matches the character . literally (case sensitive)

ncirl 与字符ncirl完全匹配(区分大小写)

ncirl matches the characters ncirl literally (case sensitive)

.与字符匹配.从字面上看(区分大小写)

. matches the character . literally (case sensitive)

即与字符匹配，即按字面值(区分大小写)

ie matches the characters ie literally (case sensitive)

$ 在字符串的末尾或行之前断言位置终止符位于字符串的末尾(如果有的话)

$ asserts position at the end of the string, or before the line terminator right at the end of the string (if any)

希望有帮助.

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