Solved

Checking Credit Card number is valid

Posted on 2011-09-20
2
453 Views
Last Modified: 2012-05-12
I need to check whether is credit card number is a valid format for the type of credit card that is giving to me. I am passing the number to other place that will do the actual check.  I had found this
for each card when I tested with actual number for the particular type for card I got errors. Am I missing something in the regular expression?

This is be coded in VBNET on the back end.

  Case "AX"
                    RegEx = New System.Text.RegularExpressions.Regex("3[4,7]\d{13}")
                Case "DS"
                    RegEx = New System.Text.RegularExpressions.Regex("6011-?\d{4}-?\d{4}-?\d{4}")
                Case "MC"
                    RegEx = New System.Text.RegularExpressions.Regex("5[1-5]\d{2}-?\d{4}-?\d{4}-?\d{4}")
                Case "VA"
                    RegEx = New System.Text.RegularExpressions.Regex("4\d{3}-?\d{4}-?\d{4}-?\d{4}")


           
0
Comment
Question by:kw66722
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 14

Accepted Solution

by:
binaryevo earned 500 total points
ID: 36569826
Try the following regex for the different card types:

Amex - ^3[47][0-9]{13}$
Discover - ^6(?:011|5[0-9]{2})[0-9]{12}$
Mastercard - ^5[1-5][0-9]{14}$
Visa - ^4[0-9]{12}(?:[0-9]{3})?$
0
 
LVL 1

Author Closing Comment

by:kw66722
ID: 36570637
worked like a charm thanks.
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Function after success of Jquery/AJAX action 9 43
Adding items to a C# list incrementally 5 60
ASP.net Markup for Sub Menu 2 41
Record locking on classic ASP 3 38
Today is the age of broadband.  More and more people are going this route determined to experience the web and it’s multitude of services as quickly and painlessly as possible. Coupled with the move to broadband, people are experiencing the web via …
User art_snob (http://www.experts-exchange.com/M_6114203.html) encountered strange behavior of Android Web browser on his Mobile Web site. It took a while to find the true cause. It happens so, that the Android Web browser (at least up to OS ver. 2.…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…

756 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question