PHP what goes wrong?

$message = "Create Admin";
        $local = "Create Admin";


        $table_Content = '
        <table>
            <form method="POST">
                <thead>
                    <tr>
                        <th colspan="2">Administrator Account Creation</th>
                    </tr>
                </thead>
                <thead>
                    <tr>
                        <th>Type</th>
                        <th>Account Information</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td>Uername:</td>
                    <td><input type="textbox" id="username" name="username" /></td>
                </tr>
                    <tr>
                        <td>Password: (minimal 8 characters)</td>
                        <td><input type="password" id="password" name="password" /></td>
                    </tr>
                    <tr>
                        <td>Re-Password</td>
                        <td><input type="password" id="repassword" name="repassword" /></td>
                    </tr>
                    <tr>
                        <td>Email:</td>
                        <td><input type="email" id="email" name="email" /></td>
                        </tr>
                    <tr>
                        <td>Re-Email:</td>
                        <td><input type="email" id="reemail" name="reemail" /></td>
                    </tr>
                </tbody>
                <tfoot>
                    <tr>
                        <td colspan="2"><input type="submit" id="submit" name="submit" style="width: 100%; height: 200%" value="Go to the next step" /></td>
                    </tr>
                </tfoot>
            </form>
        </table>
    ';


        if($submit){

            $message = "Admin Account Submitted!";
            if(regex($username,"username") == false){
                $message = '<center><font color="Red">Username MUST contain atleast 4 characters
                <br />Characters Allowed: <strong>a-z & A-Z & 0-9 & - & _</strong><br /><hr>'.$table_Content;
                $local = "Error";
            }else{
                $message = 'Username Allowed!';
            }
        } //for some reason if I output $message it does NOT output the $table_Content;