Credit Card Validation, ereg

[networkdad]

Hi, i've got a bit of code that already validates some card numbers, from visa, MC, and a few others. Now, i need to include support for UK Switch, but they have many bin numbers that vary from 16 to 19 digits long.

Below, is what i typically use for MasterCard:

  class cc_validation {
    var $cc_type, $cc_number, $cc_expiry_month, $cc_expiry_year;

function validate($number, $expiry_m, $expiry_y) {
  $this->cc_number = ereg_replace('[^0-9]', '', $number);

  if (ereg('^5[1-5][0-9]{14}$', $this->cc_number) and CC_ENABLED_MC=='1') {
    $this->cc_type = 'Master Card';

and here is what i have come up for a few bin's for UK Switch:

} elseif (ereg(^(675938|675939|675940)([0-9]{10})([0-9]{2})([0-9])?$', $this->cc_number) and CC_ENABLED_UKSWITCH=='1') {
        $this->cc_type = 'UK Switch';

Am i doing this correctly, so that any of the above BIN's for UK switch can be 16, 18, or 19 digits long ?

Thanks.. 🙂

[xblue]

the first part may be correct (if numbers may start with 675938, 675939 or 675940) but could be shortened

6759(38|39|40)

the rest seems a little strange, why not simply

[0-9]{10,13}

(I think ereg should support lower and upper limits for quantifiers, but I'd recommend to use preg functions anyway)

[networkdad]

I'll give that a shot, thank you - That makes sense now.

[networkdad]

hmm...i must still not be doing this correctly.

For this BIN range, 675900 - 675999 (any card number that starts with any prefix in that range), i have:

      } elseif (ereg('^6759[0-9]{1}[0-9]{1}([0-9]{10,13,14)?$', $this->cc_number)

I also tried:

      } elseif (ereg('^6759([0-9]{1})([0-9]{1})([0-9]{10,14)?$', $this->cc_number)

Basically, 6759+Any number 0 thru 9+Any number 0 thru 9+ 10 to 14 digits more in length giving me 16, 18, or 19 digits long only will validate.

[networkdad]

Well...this appeared to work:

      } elseif (ereg('^6759[0-9]{2}([0-9]{10,13})?$', $this->cc_number)

It validated a 19 digit number..We'll see how others validate now - They've got to make it thru a mod10 check