在PHP中使用正则表达式进行电子邮件验证
在PHP中使用正则表达式进行电子邮件验证
提问于 2012-12-05 17:23:20
我对正则表达式是个新手。我正在开发一个PHP项目，我需要验证电子邮件地址。在这个网站和谷歌搜索后，我发现下面的正则表达式说它应该工作得最好。
if (preg_match("/^(?!(?:(?:\x22?\x5C[\x00-\x7E]\x22?)|(?:\x22?[^\x5C\x22]\x22?)){255,})(?!(?:(?:\x22?\x5C[\x00-\x7E]\x22?)|(?:\x22?[^\x5C\x22]\x22?)){65,}@)(?:(?:[\x21\x23-\x27\x2A\x2B\x2D\x2F-\x39\x3D\x3F\x5E-\x7E]+)|(?:\x22(?:[\x01-\x08\x0B\x0C\x0E-\x1F\x21\x23-\x5B\x5D-\x7F]|(?:\x5C[\x00-\x7F]))*\x22))(?:\.(?:(?:[\x21\x23-\x27\x2A\x2B\x2D\x2F-\x39\x3D\x3F\x5E-\x7E]+)|(?:\x22(?:[\x01-\x08\x0B\x0C\x0E-\x1F\x21\x23-\x5B\x5D-\x7F]|(?:\x5C[\x00-\x7F]))*\x22)))*@(?:(?:(?!.*[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-[a-z0-9]+)*\.){1,126}){1,}(?:(?:[a-z][a-z0-9]*)|(?:(?:xn--)[a-z0-9]+))(?:-[a-z0-9]+)*)|(?:\[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|(?:(?!(?:.*[a-f0-9][:\]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?)))|(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)|(?:(?!(?:.*[a-f0-9]:){5,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?)))?(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))(?:\.(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))){3}))\]))$/iD", strtolower($mail_address))) {
echo "valid email";
}但是当我使用它时，我得到的错误是，
"Warning: preg_match(): No ending delimiter '/' found"这段代码有什么问题？
回答 10
Stack Overflow用户
回答已采纳
发布于 2012-12-05 17:25:42
使用此表达式而不是正则表达式：
if(filter_var($email, FILTER_VALIDATE_EMAIL)) {
//Valid email!
}使用正则表达式来验证电子邮件地址是not recommended，因为它肯定是not pretty，特别是如果您不想排除具有符合RFC822语法的有效电子邮件地址的人。
http://www.php.net/filter_var是你最好的选择。
一个疯狂的正则表达式示例，它试图根据RFC 822语法验证电子邮件地址：
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?:\r\n)?[ \t])*))*)?;\s*)Stack Overflow用户
发布于 2012-12-05 17:31:59
看起来你并不需要更大的代码来验证一封电子邮件。
<?php
$email = "abc123@sdsd.com";
$regex = '/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/';
if (preg_match($regex, $email)) {
echo $email . " is a valid email. We can accept it.";
} else {
echo $email . " is an invalid email. Please try again.";
}
?>试试这个，让我知道
Stack Overflow用户
发布于 2012-12-05 17:26:27
您应该使用函数filter_vars()来验证您的输入，而不是您自己的regexp。
示例：
filter_var('bob@example.com', FILTER_VALIDATE_EMAIL)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/13719821
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