Question

Before you mark this as answered in another post (I already saw those). But in none of them they specifically say the REGEX they suggest works for C# (I think they focus more on Javascript). Now I am not too good with regex but I would appreciate any help determining how to get the type and once I get the regex how can I validate the cc entered against the regex?

I saw this as an answer in many of the posts here in StackOverflow, but would this work in C# (same code) if yes how can i compare my creditCard string to the regex?

Get Card Type based on number

I would really appreciate any help, this is the first time i deal with credit card validation, just need to get the type. Drop down is out of the question based on the feedback from the person needing it.

Answer 1

Any of the regular expressions on that page will work in C#. For example:

string isVisa = "^4[0-9]{12}(?:[0-9]{3})?$";
string ccnumber = "1234123412341234";

if (System.Text.RegularExpressions.Regex.IsMatch(ccnumber, isVisa)) {
  // valid Visa card
}

A program I always recommend to test out regular expressions in C# is Expresso. You will be able to test out any of the credit card number validation patterns in that program.