E. Regular Expressions
Warning!
Entire books have been written on this topic. Rather that attempt to cover the content of a book in a few pages, this primer hopes to introduce the material and provide the absolute least amount of knowledge needed to get started with Django Unleashed. I recommend using a full reference when programming or if any of this information proves to be unclear.
A regular expression answers a binary question: Does this string meet a set of requirements? These requirements are created by regular expression patterns. A regular expression pattern will either match (true) or reject (false) a string. These patterns look arcane but are actually quite simple.
Imagine we have a list of first names mixed in with pseudonyms, ...
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