Regex Gone Wild in Python

Warning: Regex Gone Wild in Python

We're not sure what happened, but it looks like someone let the regex run amok.
Batteries are being sold as door-to-door by regex-wielding maniacs.
You've been warned.

• Advanced Syllabus
• Regular Expression Recipes

Regex Gone Wild in Python

For those who've been lost in the wilderness of regular expressions.
Here's a map to help you find your way out.