Parse Credit Card input from Magnetic Stripe

Question

Does anyone know how to parse a credit card string input from a Magnetic Card Swiper?

I tried a JavaScript parser but never got it to work. This is what the input l

Answer 1

From what I can remember:

That is a two-track magnetic strip data - first track starts with % and ends with ?, the second track starts with ; and ends with ?. These are Start/End markers.

The first track is alphanumeric, the second track is numeric, and there is a third track which is numeric also (if my memory serves correct).

The data between the start/end markers can be variable depending on the recording density of the magnetic strip. The higher the density, the more it can be recorded on one track.

Using a regex to get at the data may not be a reliable method to pick out the information required.

And not all credit cards have exactly two tracks, some uses three tracks.