Cant get my regex to validate my html form

Cant get my regex to validate my html form

I have a html form with some client validation and some server validation
(regex). But i cant get the regex to work with the html form, and it
possible to submit the form without any inputs. I have been stuck on this
for hours, argh. Any one that can understand why?
This is the HTML form

<form action="brukerinfo.php" method="post" name="kontaktskjema"
id="kontaktskjema">
<h3>Registrer din informasjon her</h3>
<div>
<label>
<span>Fornavn: (påkrevd)</span>
<input name="fornavn" id="fornavn"
placeholder="Fornavn" type="text" tabindex="1"
pattern="^[a-zA-ZæøåÆØÅ]{2,}$"
title="Fornavn er påkrevd, og må være minst 2
tegn" required autofocus>
</label>
</div>
<div>
<label>
<span>Etternavn: (påkrevd)</span>
<input name="etternavn" id="etternavn"
placeholder="Etternavn" type="text" tabindex="2"
pattern="^[a-zA-ZæøåÆØÅ]{2,}$"
title="Etternavn er påkrevd, og må være minst 2
tegn og kan ikke bestå av mellomrom" required>
</label>
</div>
<div>
<label>
<span>Email:</span>
<input name="email" id="email" type="email"
placeholder="Skriv inn din mailadresse"
tabindex="3">
</label>
</div>
<div>
<label>
<span>Telefon: (påkrevd) </span>
<input name="telefon" id="telefon"
placeholder="Skriv inn ditt telefonnummer"
type="tel" tabindex="4"
pattern="[0-9]{8}" title="Må bestå av 8 siffer"
required>
</label>
</div>
<div>
<label>
<span>DOB:</span>
<input name="fdag" id="fdag" type="date"
tabindex="5" required>
</label>
</div>
<div>
<button name="submit" type="submit"
id="kontaktskjema-submit">Send inn</button>
</div>
</form>
</div>
</div>
enter code here
And this i the regex validation,
<?
//preg_match for email
$email = $_POST['email'];
$emailregex = '[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,4}';
if(isset($_POST['email'])) {
if (!preg_match($emailregex, $email)) {
echo 'invalid email';
}
}
//validating the phone number
$telefon = $_POST ['telefon'];
$telmatch = array('98979695'
,'97969594','90807090','90908080','40908070','45674849','46573823','45343456');
if(isset($_POST['telefon'])){
if(!preg_match($telefon, $telmatch)){
echo 'invalid phone number';
}
}
//validatin the date
$fdag = $_POST['fdag'];
if(isset($_POST['fdag'])) {
if(preg_match('/(0[1-9]|[1-2][0-9]|3[0-1])-(0[1-9]|1[0-2])-^[0-9]{4}$/',
$fdag))
{
if(date(Y, time()) - date(Y,strtotime($fdag)) > 16){
echo 'invalid date';
}
else
{
echo 'you have to be at least 16';
}
}
}
?>

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For example Say I have this text:
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