Version_changes.md

4.5

• Python version updated to 3.13
  • deprecated features, SyntaxWarning, name change from re.error to re.PatternError
• Corrected typos, updated descriptions, timing results and external links
• Exercises are now numbered instead of using alphabets

4.1

• Updated details for re(gex)? playground app
• Added section for re(gex)? exercises app
• Better sample input for one of the exercises
• Corrected one of the exercise solutions and added alternate solution for another exercise

4.0

• Python version updated to 3.11
  • Possessive quantifiers and Atomic grouping are now supported by the re module
• regex module
  • corrected examples and descriptions for \G and \K features
  • added railroad diagram for the recursive matching section
• In general, many of the examples, exercises, solutions, descriptions and external links were updated/corrected
• Updated Acknowledgements section
• Code snippets related to info/warning sections will now appear as a single block
• New section added for re(gex)? playground
• Book title changed to Understanding Python re(gex)?
• New cover image
• Images centered for EPUB format

3.2

• Corrected typos in description, cheatsheet, exercises and solutions
• Updated Acknowledgements section

3.1

• Added real world regular expressions usage examples and overview of book in introduction chapter
• Added links to single file collation of exercises and solutions
• Added information about flashtext and PythonVerbalExpressions
• Corrected typos in exercises and solutions
• Corrected order of sorting for usage of dict in replacement section

3.0

• Separated out regex module as a separate chapter (with description for more features) instead of mixing up with re module contents
• Added plenty of new exercises, perhaps too many
• Updated and clarified descriptions for many concepts, too many changes to list individually
• Added description for new features in Python 3.8 like \N escape sequence
• Added two interlude chapters to highlight external resources
• Added separate section about escape sequences and differences compared to string literals
• Added section for re.fullmatch function and modified/added several examples/exercises in multiple chapters to highlight its usage
• Added section for conditional group (?(id/name)yes-pattern|no-pattern)
• Converted chapter/section references to clickable links
• And many more typo corrections and miscellaneous changes

2.1

• corrected a typo
• changed background color of code snippets for better contrast

2.0

• added Table of Contents
• changed book formatting
  • better contrast for chapter and section names
  • increased font size and page margins
• added cheatsheet at end of chapters
• improved descriptions and examples
• corrected minor typos and improved grammar (some were based on feedback received)

1.3

• changed cover image
• added warning and info icons to highlight notes
• better wording and test strings for 3rd lookaround exercise

1.2

• added debuggex links, this site provides railroad diagrams to help understand complex REs
• corrected flag for recursive matching section, wasn't caught in code snippet testing as both re.X and regex.X have same constant value

1.1

• Corrected a greedy quantifiers exercise where answer wasn't deleted :-/
• added CommonRegex as further reading link

1.0

• First version