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Showing content from https://learnbyexample.github.io/Ruby_Regexp/further-reading.html below:

Further Reading - Understanding Ruby Regexp

1. Cover
2. Buy PDF/EPUB versions
3. 1. Preface
4. 2. Why is it needed?
5. 3. Regexp introduction
6. 4. Anchors
7. 5. Alternation and Grouping
8. 6. Escaping metacharacters
9. 7. Dot metacharacter and Quantifiers
10. 8. Interlude: Tools for debugging and visualization
11. 9. Working with matched portions
12. 10. Character class
13. 11. Groupings and backreferences
14. 12. Interlude: Common tasks
15. 13. Lookarounds
16. 14. Modifiers
17. 15. Unicode
18. 16. Further Reading
19. 17. Exercise Solutions


20.    Source code
21.    My Blog
22.    My Books
23.    learnbyexample weekly
24.    Twitter

Note that some of these resources are not specific to Ruby. So you'll have to adapt them to Ruby's regexp syntax.

• rubular — Ruby regular expression editor, handy way to test your regexp
• RubyVerbalExpressions — construct regular expressions with natural language terms
• CommonRegexRuby — collection of common regular expressions
• regexp-examples — Generate strings that match a given Ruby regular expression
• Awesome Regex — curated collection of libraries, tools, frameworks and software
• stackoverflow: ruby regexp
• stackoverflow: regex FAQ
  • stackoverflow: regex tag is a good source of exercise questions
• rexegg — tutorials, tricks and more
• regular-expressions — tutorials and tools
• regexcrossword — tutorials and puzzles, only supports JavaScript flavor
• debuggex — railroad diagrams for regular expressions, doesn't support Ruby flavor
• swtch — stuff about regular expression implementation engines

Here are some links for specific topics:

• rexegg: best regex trick
• regular-expressions: matching numeric ranges
• regular-expressions: Continuing at The End of The Previous Match — especially the second section that discusses implementation details
• regular-expressions: Zero-Length Matches
• stackoverflow: Greedy vs Reluctant vs Possessive Quantifiers
• cloudflare: Details of the Cloudflare outage on July 2, 2019 — see appendix for details about CPU exhaustion caused due to regular expression backtracking

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