表单字段验证自定义电子邮件要求

Looking to create a form validation on email text field. Have previously used validation to ensure correct email is produced.

希望在电子邮件文本字段上创建表单验证。之前已使用验证来确保生成正确的电子邮件。

But here looking to create a more custom rule which allows only emails ending in the format .ac.uk

但这里希望创建一个更自定义的规则,只允许以.ac.uk格式结尾的电子邮件

Here a user would be able to provide any university/college/instituion as long as the last 6 characters in the string = .ac.uk with the general format for the mail as follows: [e-mail]

在这里,用户可以提供任何大学/学院/机构,只要字符串= .ac.uk中的最后6个字符,邮件的一般格式如下:[e-mail]

Solution preferably in PHP, currently looking at employing a rule using the end part in this statement:

解决方案最好在PHP中,目前正在考虑使用本声明中的结尾部分使用规则:

^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$

Making this part *(\.[a-z]{2,3}) relate to the .ac.uk

使这部分*(\。[a-z] {2,3})与.ac.uk有关

many thanks, much appreciated Jeanclaude

非常感谢,非常感谢Jeanclaude

1 个解决方案

#1

I would first run the email through filter_var($email, FILTER_VALIDATE_EMAIL) rather than using a simple regex. It's not perfect (I've found a few edge cases that don't validate correctly) but it works well. Once you know it's a valid email address you can simply trust substr($email, -6) == '.ac.uk' and be done with it. Something like:

我首先通过filter_var($ email,FILTER_VALIDATE_EMAIL)运行电子邮件,而不是使用简单的正则表达式。它并不完美(我发现了一些无法正确验证的边缘情况),但效果很好。一旦你知道它是一个有效的电子邮件地址,你可以简单地信任substr($ email,-6)=='。ac.uk'并完成它。就像是:

if (filter_var($email, FILTER_VALIDATE_EMAIL) 
    && strtolower(substr(trim($email), -6))) === '.ac.uk') {

    // Valid
}