我有这个代码来检查电子邮件是否有效：
$email = "[email protected] /cdn-cgi/l/email-protection";
$regex = '/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/';
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.";
}
假设我有以下字符串：
<html>
<body>
<p>[email protected] /cdn-cgi/l/email-protection</p>
</body>
</html>
我如何检查该字符串是否包含电子邮件？ （因为它不适用于上面的代码）
The ^ and $是锚点，需要完整的字符串匹配。如果你把它去掉，它将匹配字符串中某处的电子邮件。
正则表达式演示：https://regex101.com/r/xI0bC2/1 https://regex101.com/r/xI0bC2/1
PHP 用法（已更新以存储找到的电子邮件）：
<?php
$email = "<html>
<body>
<p>[email protected] /cdn-cgi/l/email-protection</p>
</body>
</html>";
$regex = '/[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})/';
if (preg_match($regex, $email, $email_is)) {
echo $email_is[0] . " is a valid email. We can accept it.";
} else {
echo $email . " is an invalid email. Please try again.";
}
PHP 演示：https://eval.in/618679 https://eval.in/618679
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