Regular expressions are used to sift through text-based data to find things. Regular expressions express a pattern of data that is to be located. Regex is its own language, and is basically the same no matter what programming language you are using with it.
In Python 3, the module to use regular expressions is re, and it must be imported to use regular expressions.
Sample code for this basics series: http://pythonprogramming.net/beginner-python-programming-tutorials/
Python 3 Programming tutorial Playlist: http://www.youtube.com/watch?v=oVp1vrfL_w4&feature=share&list=PLQVvvaa0QuDe8XSftW-RAxdo6OmaeL85M
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