Busy — Sat, 23 Oct 2004 00:35:37 +0000

Another way is to force the required input length.

Using form input boxs set them to required length, ie 4,3,3,3 or whatever they are.
If you want to get fancy you could use a javascript switch, so they choose a card type, and on that choice the fields are displayed (if you needed 6,4,4 or whatever) then you could just validate the fields seperatly, then join them and do whatever with them - store, send ...

visa
input(maxsize 4) - input(maxsize 4) - input(maxsize 4) - input(maxsize 4)

amex
input(maxsize 4) - input(maxsize 6) - input(maxsize 5)

Greg K — Fri, 22 Oct 2004 11:02:06 +0000

Here is the only one on that link for Credit Cards:

Quote:
Expression: ^((4\d{3})|(5[1-5]\d{2}))(-?|\040?)(\d{4}(-?|\040?)){3}|^(3[4,7]\d{2})(-?|\040?)\d{6}(-?|\040?)\d{5}

Description: Credit card validator for AMEX, VISA, MasterCard only. Allows spaces, dashes, or no separator between digit groups according to the layout (4-6-5 for AMEX, 4-4-4-4 for Visa and Mastercard)

Matches: [3711-078176-01234], [4123 5123 6123 7123], [5123412361237123]

Non-Matches: [3711-4123-5123-6112]

This would be quite close, just need to add one for Discover cards (starts with a 6) and one for the older (don't know if really need them, but better safe than sorry) 13 digit (4-3-3-3) visas

Then would still need to use the other code for doing the checksum on the card number.

I'll try adapting this in later today.

-Greg

Busy — Fri, 22 Oct 2004 10:11:42 +0000

try this site for php expressions
http://www.regexplib.com/DisplayPatterns.aspx?cattabindex=2&categoryId=3

hopefully you can find something usefull

Abhishek Reddy — Fri, 22 Oct 2004 07:29:49 +0000

Surely using regular expressions would abbreviate a lot of this code. I might have a crack at it later.

It might be a good idea to turn it into a class, so the code is more easily deployed.