A proposal under consideration by Python’s development team would finally bring pattern matching statements to the language.

How to use the regular expression functions provided by the ‘re’ library to match, search, and replace text in your Python programs.

Regular expressions are a way to describe patterns of text that can be useful for processing text documents or wherever one might want to look for a pattern and possibly replace another ...

If you work with text, you owe it to yourself to learn regular expressions, and Patterns can help you do that--as well as figure out exactly what your search patterns are capturing.