<?php
$link = "google.com";
if (!preg_match('/\b(?:(?:https?|ftp):\/\/|(?:www\.)?)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i',$link)) {
echo '<label style="color:#fff">Sorry, your link is not in a valid address format.</label><br>';
$error = 1;
}
else echo "Good link!";
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