Regexp Crash Course
A free 14-part email course in Python regexps: character classes, quantifiers, groups, anchors, and re.search, re.findall and re.sub, with daily exercises.
Regexp Crash Course launched on April 6, 2020 with 16 votes, #1,149 of 5,003 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 6 years on.
In plain words
Regexp Crash Course is a learning resource for understanding regular expressions. Launched in 2020, it provides instruction on how to work with regex patterns and syntax. The course is designed for anyone looking to learn or improve their regular expression skills, whether for programming, text processing, or data validation tasks. It offers a structured approach to mastering this technical skill through its web-based platform.
written from the facts on this page · September 2026
From the sources
Do you work with text? If you’re a programmer, the answer is almost certainly “yes.” Working with text can be easy… but searching through it can be difficult, especially if you’re trying to find complex patterns. Over the years, many programmers have learned to use regular expressions to find and retrieve patterns in text — but “regexps” (aka “regexes”) are notoriously hard to learn. I certainly remember, back in 1988, wondering how I was supposed to use this crazy syntax. I’m on a mission to teach regexps to as many people as possible. If you’re a programmer, then you can learn regexps. It’ll take some time, but you can do it! Subscribe to this 14-part e-mail course — my “regexp crash…from regexpcrashcourse.com
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My book titled "Python re(gex)?" is free to download through this weekend [1][2] The book covers both 're' and 'regex' modules, has plenty of examples and chapters also have cheatsheets and exercises. Code snippets, exercises, sample chapters, etc are available on GitHub repo [3] I used pandoc+xelatex [4] to generate the pdf. [1] https://gumroad.com/l/py_regex [2] https://leanpub.com/py_regex [3] https://github.com/learnbyexample/py_regular_expressions [4]…
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Learn Regular Expressions with simple, interactive exercises2020 · regexone.com · ▲144RegexOne provides a set of interactive lessons and exercises to help you learn regular expressions
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