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Validate Email Addresses With PHP preg_match() and a Regex
Here we use the preg_match() function and regular expression logic to demonstrate how to validate email addresses to make sure they consist of the proper structure for a valid email address. If a proper email address is not given we can send a message back to the user to please supply a valid email address. You can use any regexp that works as there are many email validation regexp examples online. Regular expressions(aka: regex or regexp) give programmers a way to make specific string structure relations through expressions to compare values in the supplied argument in preg_match(). Let's check to see if an email address given in a form is valid or not:
<?php $email = "abc123@lolhaha"; // Invalid email address $regex = "^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$"; 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."; } ?>
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