VALIDATING EMAIL ADDRESSES - May 29th, 2013

There are many times when the format of an email address needs to be validated. There's a built in function in CMSB called isValidEmail that will do that for you, and might be used in the errorsandAlerts section of your viewer like this: <?php if (!isValidEmail(@$_REQUEST['email_address'])) { $errorsAndAlerts .= "Please enter a valid E-mail address (example: user@example.com)\n"; } ?> But to understand how it works, here's an regular expression approach that you can modify to suit your needs. They all assume that the email address field is called email_address To list all email addresses in an existing list with invalid formats: <?php $count = 0; ?> <?php foreach ($your_tableRecords as $record ): ? <?php // in the code \.[a-z0-9-]+)*(\.[a-z]{2,4}) 2 is the minimum and 4 is the maximum characters after the period to account for TLDs like .us and .info $email_address = $record['email_address']; if(!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$", $email_address)) { echo $record['email_address'] ; $count++; } ?> <?php endforeach ?> <br /> <br /> There are <?php echo $count ?> invalid email addresses in this list. If you want to list all email addresses with valid formats remove the ! from before eregi You'll find many other useful regular expressions here: http://www.virtuosimedia.com/dev/php/37-tested-php-perl-and-javascript-regular-expressions

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