Used to get a value from a class e.g.: [...] class="font-12"[...] This regEx will receive "12" given the content of the class

Validates Credit Card Numbers of different type. Supports Visa, MasterCard, American Express, Diners Club, Discover and JCB Taken from http://www.regular-expressions.info/creditcard.html If you want to support only a particular type, customise it based on following....

Simple name matching Matches english names only, you may add international characters to list of characters.

Detect various possible HTML linebreak tags (eg. )

http://www.r-project.org/mail.html

It may be useful inorder to replace those lines with li

Gets all parts of URL including port, username, password, fragment, query, and path

This will remove all facebook urls from a HTML string

Matches every polynomial you want ;)