validate phone and fax input

[conte]

hi,

 

another question to input fields, which i could not find answered in the forums:

 

how could i best validate that in the phone and fax fields only + and numbers are allowed.

Standard OSC allows every character.

 

i have tried some regular expressions and it seems to work in the javascript form_check.js.php file, but not in create_account.php file (e.g when javascript is turned off in the browser)

 

here is my code for the create_account.php:

//check phone agains regex


 if ($telephone != '' && strlen($telephone) < ENTRY_TELEPHONE_MIN_LENGTH ) {
  $error = true;

  $messageStack->add('create_account', ENTRY_TELEPHONE_NUMBER_ERROR);
}

if ($fax !='' && strlen($fax) < ENTRY_TELEPHONE_MIN_LENGTH ) {
  $error = true;

  $messageStack->add('create_account', ENTRY_FAX_NUMBER_ERROR);
}

 if ($telephone != '' && !(ereg('^(\+|00)[1-9]{1,3}(\.|\s|-)?([0-9]{1,5}(\.|\s|-)?){1,3}$',$telephone))) {
  $error = true;

  $messageStack->add('create_account', ENTRY_TELEPHONE_FORMAT_ERROR);
}

if ($fax !='' && !(ereg('^(\+|00)[1-9]{1,3}(\.|\s|-)?([0-9]{1,5}(\.|\s|-)?){1,3}$',$fax))) {
  $error = true;

  $messageStack->add('create_account', ENTRY_FAX_FORMAT_ERROR);
}

 

I check if the fields are empty (because they are optional on my site).

When they are not empty, they must at least be ENTRY_TELEPHONE_MIN_LENGTH long.

When they are not empty, they mus be in one of these formats:

 

+21123456789

+31 1234 12345667

+31123 123

+31.1231.123213123

 

 

and so on like in the regex.

 

But i always get the ENTRY_TELEPHONE_FORMAT_ERROR message, no matter how i put in the phone number.

 

Can anyone help please? Or has anyone a better solution for this problem?

Thanks