For being selective you could use predicates 
could be something like this
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The Confluence of Individual Knowledge and the Collective Intelligence
At this writing (summer 2013) the term API (http://dictionary.reference.com/browse/API?s=t) has made its way into the popular lexicon of the English language. A few years ago, …
I found this questions asking how to do this in many different forums, so I will describe here how to implement a solution using PHP and AJAX.
The logical flow for the problem should be:
Write an event handler for the first drop down box to get …
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: