Detecting credit card numbers in text

Question

I am trying to find a component or method that will determine the number of credit cards of various types in the text.

I found a lot of information on checking a credit card number, but I need to be able to take the text of the text, for example. web page and check if credit card numbers, bank account numbers and sort codes are available.

Does anyone know of a component that can help commercial or otherwise? In particular, my platform is.net C #, but if anyone knows about solutions in other technologies, it would be nice to know what they are.

Thanks for your help.

Answer 1

This requires regular expression :)

Check out this page http://www.regular-expressions.info/creditcard.html , especially the "Search for credit card numbers in documents" section. (Although you are likely to find false positives when searching for 16-digit numbers.)

Answer 2

Since credit card numbers are in a fixed format, simple enough is common.