Regular Expressions & Alternative Syntax

//I learned here http://regexone.com/

<!DOCTYPE HTML>

<html>

    <head>
        <meta charset="UTF-8">
    </head>

    <body>

        <?php if(isset($_GET['yourname'])):

            $pattern = "/[A-Z][a-z]* [A-Z][a-z]*/";
            preg_match($pattern, $_GET['yourname'], $matches);
            if(isset($matches[0]) && $_GET['yourname'] == $matches[0]): ?>

                <p>Your name is "<?php echo $_GET['yourname']; ?>"</p>
            <?php else: ?>

                <p>Your name is invalid!</p>
            <?endif;

            $pattern = '/([a-z0-9(._)]*)@([a-z0-9]*)\.([a-z(.)]*)/';
            preg_match($pattern, $_GET['youremail'], $matches);


            if(isset($matches[0]) && $_GET['youremail'] == $matches[0]): ?>

                <p>Your e-mail is "<?php echo $_GET['youremail']; ?>"</p>
            <?php else: ?>

                <p>Your e-mail is invalid!</p>
            <?endif;

            $pattern = '/(\d{2})(\d{7})/';
            preg_match($pattern, $_GET['yournumber'], $matches);


            if(isset($matches[0]) && $_GET['yournumber'] == $matches[0]): ?>

                <p>Your number is "<?php echo $_GET['yournumber']; ?>"</p>

                <?php
                switch($matches[1]):
                case 96:
                    echo "<p>You are from cell phone service one!</p>";
                    break;
                case 91:
                    echo "<p>You are from cell phone service two!</p>";
                    break;
                case 93:
                    echo "<p>You are from cell phone service three!</p>";
                    break;
                endswitch;
            else: ?>

                <p>Your number is invalid!</p>
            <?endif;

        else: ?>

            <form action="register_regex.php" method="get">
                <input type="text" name="yourname" placeholder="Write your 'FirstName LastName'"><br>
                <input type="text" name="youremail" placeholder="Write your e-mail"><br>
                <!--I know we can use type="e-mail"! Thanks to HTML 5 -->
                <input type="text" name="yournumber" placeholder="Introduce your phone number"><br>

                <input type="submit" value="Send">
            </form>

        <?php endif; ?>

    </body>

</html>