In the first article: A Better Website Login System (http://www.experts-exchange.com/A_2902.html) I introduced the EE Collaborative Login System and its intended purpose.
In this article I will discuss some of the design consideratio…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions.
Consider email address RFCs:
Look at HTML5 form input element (with type=email) regex pattern: