In this course, I present everything that can practically be useful and what you can encounter getting bogged down with regular expressions. I describe what they are, I give many examples, I discuss regular expressions outside the basic list (regular expressions are extended in Python). I highly recommend the course to all those who have too few problems in theirs life. Following that chestnut: Some people, when confronted with a problem, think "I know, I'll use regular expressions." Now they have two problems.
Go to the course.