Based on http://www.regular-expressions.info/creditcard.html This example includes test strings. This only validates the pattern, and not whether the credit card number passes a checksum validation. See the Luhn algorithm for details https://en.wikipedia.org/wiki/Luhn_algorithm...

Switches the order of two functions in a parameter.

Given a number N represented by its unary form N(1), when RegEx doesn't match N(1), N is prime

don't use my older one

To convert the BizTalk schema output to one string

Matches words without external punctuation but with internal punctuation.

stackoverflow question

This regex defines the end and the beginning of a WindowsUpdate.log event.

get contents of src attribute

just lovely

Matches a password that has been passed in as a url query parameter or in a post dictionary.