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Commit b2c5735

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updates for version 4.5
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‎LICENSE‎

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MIT License
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Copyright (c) 2021 Sundeep Agarwal
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Copyright (c) 2025 Sundeep Agarwal
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal

‎README.md‎

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<p align="center"><img src="./images/py_regex_ls.png" alt="Understanding Python re(gex)? ebook cover image" /></p>
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The book also includes exercises to test your understanding, which are presented together as a single file in this repo — [Exercises.md](./exercises/Exercises.md)
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The book also includes exercises to test your understanding, which are presented together as a single file in this repo — [Exercises.md](./exercises/Exercises.md).
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For solutions to the exercises, see [Exercise_solutions.md](./exercises/Exercise_solutions.md).
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# E-book
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* You can purchase the pdf/epub versions of the book using these links
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* https://learnbyexample.gumroad.com/l/py_regex
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* You can purchase the pdf/epub versions of the book using these links:
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* https://leanpub.com/py_regex
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* https://learnbyexample.gumroad.com/l/py_regex
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* You can also get the book as part of these bundles:
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* **All books bundle** bundle from https://learnbyexample.gumroad.com/l/all-books
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* Includes all my programming books
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* **All books bundle** bundle from https://leanpub.com/b/learnbyexample-all-books or https://learnbyexample.gumroad.com/l/all-books
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* **Learn by example Python bundle** from https://leanpub.com/b/python-bundle or https://learnbyexample.gumroad.com/l/python-bundle
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* **Awesome Regex** bundle from https://leanpub.com/b/regex or https://learnbyexample.gumroad.com/l/regex
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* **The Indie Python Extravaganza** bundle from https://leanpub.com/b/theindiepythonextravaganza
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* Includes *Python 101*, *Pydon'ts*, *Python re(gex)?*, *Practice Python Projects* and *Clean Architectures in Python*
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* [Python 101 + Python re(gex)?](https://leanpub.com/b/python101pythonregex) or [Python 201: Intermediate Python + Python re(gex)?](https://leanpub.com/b/python201_and_regex)
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* Python 101/201 is authored by [Michael Driscoll](https://www.blog.pythonlibrary.org/)
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* See https://learnbyexample.github.io/books/ for list of other books
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* See https://learnbyexample.github.io/books/ for a list of other books
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For a preview of the book, see [sample chapters](./sample_chapters/py_regex_sample.pdf)
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For a preview of the book, see [sample chapters](./sample_chapters/py_regex_sample.pdf).
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The book can also be [viewed as a single markdown file in this repo](./py_regex.md). See my blogpost on [generating pdfs from markdown using pandoc](https://learnbyexample.github.io/customizing-pandoc/) if you are interested in the ebook creation process.
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The book can also be [viewed as a single markdown file in this repo](./py_regex.md). See my blogpost on [generating pdf/epub from markdown using pandoc](https://learnbyexample.github.io/customizing-pandoc/) if you are interested in the ebook creation process.
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For the web version of the book, visit https://learnbyexample.github.io/py_regular_expressions/
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‎Resources_list.md‎

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# Learning resources
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**Note** that some of these resources are not specific to Python. So you'll have to adapt them to Python's syntax.
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Note that some of these resources are not specific to Python. So you'll have to adapt them to Python's syntax.
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* [docs.python: Regular Expression HOWTO](https://docs.python.org/3/howto/regex.html)
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* [Python 3 Module of the Week: re](https://pymotw.com/3/re/index.html) — covers till Python version 3.7.9
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* [stackoverflow: python regex](https://stackoverflow.com/questions/tagged/python+regex?sort=votes&pageSize=15)
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* [PythonVerbalExpressions](https://github.com/VerbalExpressions/PythonVerbalExpressions) — construct regular expressions with natural language terms
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* [CommonRegex](https://github.com/madisonmay/CommonRegex) — collection of common regular expressions
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* [Awesome Regex](https://github.com/aloisdg/awesome-regex) — curated collection of libraries, tools, frameworks and software
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* [Awesome Regex](https://github.com/slevithan/awesome-regex) — curated collection of tools, tutorials, libraries, etc
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* [Generate strings that match a given regular expression](https://stackoverflow.com/q/492716/4082052)
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* [stackoverflow: regex FAQ](https://stackoverflow.com/q/22937618/4082052)
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* [stackoverflow: regex tag](https://stackoverflow.com/questions/tagged/regex) is a good source of exercise questions

‎Version_changes.md‎

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<br>
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### 4.5
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* Python version updated to 3.13
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* deprecated features, SyntaxWarning, name change from `re.error` to `re.PatternError`
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* Corrected typos, updated descriptions, timing results and external links
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* Exercises are now numbered instead of using alphabets
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<br>
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### 4.1
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* Updated details for **re(gex)? playground** app

‎code_snippets/Gotchas.py‎

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re.sub(r'(?i)key', r'(\g<0>)', 'KEY portkey oKey Keyed')
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import re
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re.sub(r'key', r'(\g<0>)', 'KEY portkey oKey Keyed', re.I)
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‎code_snippets/Lookarounds.py‎

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re.sub(r'.(?<![pr].)', '*', 'spare')
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re.sub(r'par(?!.*s)', '[\g<0>]', 'par spare part party')
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re.sub(r'par(?!.*s)', r'[\g<0>]', 'par spare part party')
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re.sub(r'(?!.*s)par', '[\g<0>]', 'par spare part party')
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re.sub(r'(?!.*s)par', r'[\g<0>]', 'par spare part party')
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re.sub(r'(?!\Z)\b(?<!\A)', ' ', 'output=num1+35*42/num2')
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re.findall(r'(?<=-)\d+(?=[:;])', '42 apple-5, fig3; x-83, y-20: f12')
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re.sub(r'par(?=.*\bpart\b)', '[\g<0>]', 'par spare part party')
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re.sub(r'par(?=.*\bpart\b)', r'[\g<0>]', 'par spare part party')
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re.findall(r'(?<=,)[^,]+(?=,)', '1,two,3,four,5')
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‎code_snippets/regex_module.py‎

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regex.search(r'(?P<date>\d{4}-\d{2}-\d{2}).*(?&date)', row)[0]
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## Set start of matching portion with \K
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## Set the start of matching portion with \K
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regex.sub(r'\b\w\K\w*\W*', '', 'sea eat car rat eel tea')
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s = 'cat scatter cater scat concatenate catastrophic catapult duplicate'
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regex.sub(r'(cat.*?){2}\Kcat', '[\g<0>]', s, count=1)
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regex.sub(r'(cat.*?){2}\Kcat', r'[\g<0>]', s, count=1)
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regex.sub(r'(cat.*?){2}\Kcat', '[\g<0>]', s)
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regex.sub(r'(cat.*?){2}\Kcat', r'[\g<0>]', s)
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row = '421,cat,2425,42,5,cat,6,6,42,61,6,6,6,6,4'
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regex.findall(r'\((?:[^()]++|\([^()]++\))++\)', eqn2)
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lvl2 = regex.compile('''
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\( #literal (
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(?: #start of non-capturing group
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[^()]++ #non-parentheses characters
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| #OR
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\([^()]++\) #level-one RE
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)++ #end of non-capturing group, 1 or more times
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\) #literal )
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lvl2 = regex.compile(r'''
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\( #literal (
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(?: #start of non-capturing group
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[^()]++ #non-parentheses characters
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| #OR
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\([^()]++\) #level-one RE
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)++ #end of non-capturing group, 1 or more times
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\) #literal )
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''', flags=regex.X)
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lvl2.findall(eqn1)
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lvl2.findall(eqn2)
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lvln = regex.compile('''
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\( #literal (
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(?: #start of non-capturing group
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[^()]++ #non-parentheses characters
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| #OR
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(?0) #recursive call
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)++ #end of non-capturing group, 1 or more times
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\) #literal )
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lvln = regex.compile(r'''
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\( #literal (
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(?: #start of non-capturing group
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[^()]++ #non-parentheses characters
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| #OR
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(?0) #recursive call
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)++ #end of non-capturing group, 1 or more times
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\) #literal )
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''', flags=regex.X)
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lvln.findall(eqn0)

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