https://www.regular-expressions.info/tutorial.html
https://www.regular-expressions.info/examples.html
https://www.regular-expressions.info/examplesprogrammer.html
https://www.datacamp.com/community/tutorials/python-regular-expression-tutorial
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https://docs.python.org/3/library/re.html#re-objects
I am not sure whether this is more of a regex concept or just plain old NLP:
https://www.datacamp.com/courses/natural-language-processing-fundamentals-in-python