updates for version 2.0

Author: learnbyexample

Diff for: Exercise_solutions.md

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2019 Sundeep Agarwal
+Copyright (c) 2023 Sundeep Agarwal
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

Diff for: Exercises.md

@@ -1,12 +1,10 @@
-# JavaScript RegExp
+# Understanding JavaScript RegExp
 
-Example based guide to mastering JavaScript regexp.
+Learn JavaScript Regular Expressions step-by-step from beginner to advanced levels with hundreds of examples and exercises. Visit https://youtu.be/8X-hUel3GxM for a short video about the book.
 
-<p align="center">
-    <img src="./images/js_regexp.png" width="320px" height="400px" />
-</p>
+<p align="center"><img src="./images/js_regexp_ls.png" alt="Understanding JavaScript RegExp ebook cover image" /></p>
 
-The book also includes exercises to test your understanding, which is presented together as a single file in this repo - [Exercises.md](./Exercises.md)
+The book also includes exercises to test your understanding, which are presented together as a single file in this repo — [Exercises.md](./Exercises.md).
 
 For solutions to the exercises, see [Exercise_solutions.md](./Exercise_solutions.md).
 
@@ -16,24 +14,20 @@ See [Version_changes.md](./Version_changes.md) to keep track of changes made to
 
 # E-book
 
-You can purchase the pdf/epub versions of the book using these links:
+* You can purchase the pdf/epub versions of the book using these links:
+    * https://learnbyexample.gumroad.com/l/js_regexp
+    * https://leanpub.com/js_regexp
+* You can also get the book as part of these bundles:
+    * **All books bundle** bundle from https://learnbyexample.gumroad.com/l/all-books
+        * Includes all my programming books
+    * **Awesome Regex** bundle from https://learnbyexample.gumroad.com/l/regex or https://leanpub.com/b/regex
+* See https://learnbyexample.github.io/books/ for a list of other books
 
-* https://learnbyexample.gumroad.com/l/js_regexp
-* https://leanpub.com/js_regexp
+For a preview of the book, see [sample chapters](./sample_chapters/js_regexp_sample.pdf).
 
-You can also get the book as part of these bundles:
+The book can also be [viewed as a single markdown file in this repo](./js_regexp.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.
 
-* **Awesome Regex** bundle from https://learnbyexample.gumroad.com/l/regex or https://leanpub.com/b/regex
-* **All books bundle** bundle from https://learnbyexample.gumroad.com/l/all-books
-    * Includes all my programming books
-
-See https://learnbyexample.github.io/books/ for list of other books
-
-For a preview of the book, see [sample chapters](https://github.com/learnbyexample/learn_js_regexp/blob/master/sample_chapters/js_regexp_sample.pdf)
-
-The book can also be [viewed as a single markdown file in this repo](./js_regexp.md). See my blogpost on [generating pdf from markdown using pandoc](https://learnbyexample.github.io/tutorial/ebook-generation/customizing-pandoc/) if you are interested in the ebook creation process.
-
-For web version of the book, visit https://learnbyexample.github.io/learn_js_regexp/
+For the web version of the book, visit https://learnbyexample.github.io/learn_js_regexp/
 
 <br>
 
@@ -47,20 +41,22 @@ For web version of the book, visit https://learnbyexample.github.io/learn_js_reg
 
 # Feedback
 
-[Open an issue](https://github.com/learnbyexample/learn_js_regexp/issues) if you spot any typo/errors.
+⚠️ ⚠️ Please DO NOT submit pull requests. Main reason being any modification requires changes in multiple places.
 
-:warning: :warning: Please DO NOT submit pull requests. Main reason being any modification requires changes in multiple places.
+I would highly appreciate it if you'd let me know how you felt about this book. It could be anything from a simple thank you, pointing out a typo, mistakes in code snippets, which aspects of the book worked for you (or didn't!) and so on. Reader feedback is essential and especially so for self-published authors.
 
-I'd also highly appreciate your feedback about the book.
+You can reach me via:
 
-Twitter: https://twitter.com/learn_byexample
+* Issue Manager: [https://github.com/learnbyexample/learn_js_regexp/issues](https://github.com/learnbyexample/learn_js_regexp/issues)
+* E-mail: `echo 'bGVhcm5ieWV4YW1wbGUubmV0QGdtYWlsLmNvbQo=' | base64 --decode`
+* Twitter: [https://twitter.com/learn_byexample](https://twitter.com/learn_byexample)
 
 <br>
 
 # Table of Contents
 
 1. Preface
-2. What's so special about Regular Expressions?
+2. Why is it needed?
 3. RegExp introduction
 4. Anchors
 5. Alternation and Grouping
@@ -79,13 +75,13 @@ Twitter: https://twitter.com/learn_byexample
 
 # Acknowledgements
 
-* [MDN: Regular Expressions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions) — documentation and examples
-* [/r/learnjavascript/](https://www.reddit.com/r/learnjavascript/) and [/r/regex/](https://www.reddit.com/r/regex/) — helpful forums for beginners and experienced programmers alike
+* [MDN: Regular Expressions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Regular_expressions) — documentation and examples
+* [/r/learnjavascript/](https://old.reddit.com/r/learnjavascript/) and [/r/regex/](https://old.reddit.com/r/regex/) — helpful forums for beginners and experienced programmers alike
 * [stackoverflow](https://stackoverflow.com/) — for getting answers to pertinent questions on JavaScript and regular expressions
 * [tex.stackexchange](https://tex.stackexchange.com/) — for help on [pandoc](https://github.com/jgm/pandoc/) and `tex` related questions
-* Cover image: [LibreOffice Draw](https://www.libreoffice.org/discover/draw/) and [regulex](https://jex.im/regulex)
+* [canva](https://www.canva.com/) — cover image
 * [Warning](https://commons.wikimedia.org/wiki/File:Warning_icon.svg) and [Info](https://commons.wikimedia.org/wiki/File:Info_icon_002.svg) icons by [Amada44](https://commons.wikimedia.org/wiki/User:Amada44) under public domain
-* [pngquant](https://pngquant.org/) and [svgcleaner](https://github.com/RazrFalcon/svgcleaner) for optimizing images
+* [oxipng](https://github.com/shssoichiro/oxipng), [pngquant](https://pngquant.org/) and [svgcleaner](https://github.com/RazrFalcon/svgcleaner) — optimizing images
 * [mdBook](https://github.com/rust-lang/mdBook) — for web version of the book
     * [mdBook-pagetoc](https://github.com/JorelAli/mdBook-pagetoc) — for adding table of contents for each chapter
     * [minify-html](https://github.com/wilsonzlin/minify-html) — for minifying html files
@@ -94,6 +90,7 @@ Twitter: https://twitter.com/learn_byexample
 
 # License
 
-The book is licensed under a [Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License](https://creativecommons.org/licenses/by-nc-sa/4.0/)
+The book is licensed under a [Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License](https://creativecommons.org/licenses/by-nc-sa/4.0/).
+
+The code snippets are licensed under MIT, see [LICENSE](./LICENSE) file.
 
-The code snippets are licensed under MIT, see [LICENSE](./LICENSE) file

Diff for: LICENSE

@@ -1,5 +1,18 @@
 <br>
 
+### 2.0
+
+* Examples and exercises added for `d` and `v` flags
+* Strings in code snippets changed to be uniformly represented in single quotes
+* 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
+* Book title changed to **Understanding JavaScript RegExp**
+* New cover image
+* Images centered for EPUB format
+
+<br>
+
 ### 1.6
 
 * Code snippets checked to work with Chrome/Chromium console version 89+

Diff for: README.md

@@ -1,4 +1,4 @@
-// OR conditional
+// Alternation
 
 const pets = /cat|dog/
 
@@ -8,7 +8,7 @@ pets.test('I like dogs')
 
 pets.test('I like parrots')
 
-'catapults concatenate cat scat'.replace(/^cat|cat\b/g, 'X')
+'catapults concatenate cat scat cater'.replace(/^cat|cat\b/g, 'X')
 
 'cat dog bee parrot fox'.replace(/cat|dog|fox/g, 'mammal')
 

Diff for: Version_changes.md

@@ -36,6 +36,10 @@ words.filter(w => /t$/.test(w))
 
 /er$/m.test('spare\npar\nera\ndare')
 
+let elements = ['spare\ntool', 'par\n', 'dare', 'spared']
+
+elements.filter(e => /are$/m.test(e))
+
 /^par$/m.test('spare\npar\nera\ndare')
 
 let items = 'catapults\nconcatenate\ncat'
@@ -44,39 +48,41 @@ console.log(items.replace(/^/gm, '* '))
 
 console.log(items.replace(/$/gm, '.'))
 
-'1\n2\n'.replace(/^/mg, 'foo ')
+console.log('1\n2\n'.replace(/^/mg, 'fig '))
 
-'1\n2\n'.replace(/$/mg, ' baz')
+console.log('1\n2\n'.replace(/$/mg, ' apple'))
 
 // Word anchors
 
-let sample = 'par spar apparent spare part'
+let words = 'par spar apparent spare part'
+
+words.replace(/par/g, 'X')
 
-sample.replace(/par/g, 'X')
+words.replace(/\bpar/g, 'X')
 
-sample.replace(/\bpar/g, 'X')
+words.replace(/par\b/g, 'X')
 
-sample.replace(/par\b/g, 'X')
+words.replace(/\bpar\b/g, 'X')
 
-sample.replace(/\bpar\b/g, 'X')
+let words = 'par spar apparent spare part'
 
-let sample = 'par spar apparent spare part'
+console.log(words.replace(/\b/g, '"').replace(/ /g, ','))
 
-console.log(sample.replace(/\b/g, '"').replace(/ /g, ','))
+'output=num1+35*42/num2'.replace(/\b/g, ' ')
 
-'foo_baz=num1+35*42/num2'.replace(/\b/g, ' ')
+'output=num1+35*42/num2'.replace(/\b/g, ' ').trim()
 
-'foo_baz=num1+35*42/num2'.replace(/\b/g, ' ').trim()
+// Opposite Word Anchor
 
-let sample = 'par spar apparent spare part'
+let words = 'par spar apparent spare part'
 
-sample.replace(/\Bpar/g, 'X')
+words.replace(/\Bpar/g, 'X')
 
-sample.replace(/\Bpar\b/g, 'X')
+words.replace(/\Bpar\b/g, 'X')
 
-sample.replace(/par\B/g, 'X')
+words.replace(/par\B/g, 'X')
 
-sample.replace(/\Bpar\B/g, 'X')
+words.replace(/\Bpar\B/g, 'X')
 
 'copper'.replace(/\b/g, ':')
 

Diff for: code_snippets/Alternation_and_Grouping.js

@@ -1,30 +1,26 @@
 // Custom character sets
 
-['cute', 'cat', 'cot', 'coat', 'cost'].filter(w => /c[ou]t/.test(w))
+['cute', 'cat', 'cot', 'coat', 'cost', 'scuttle'].filter(w => /c[ou]t/.test(w))
 
 'meeting cute boat site foot'.replace(/[aeo]+t/g, 'X')
 
-'Sample123string42with777numbers'.match(/[0123456789]+/g)
-
 // Range of characters
 
 'Sample123string42with777numbers'.match(/[0-9]+/g)
 
-'coat Bin food tar12 best'.match(/\b[a-z0-9]+\b/g)
+'coat Bin food tar12 best Apple fig_42'.match(/\b[a-z0-9]+\b/g)
 
-'coat tin food put stoop best'.match(/\b[p-z][a-z]*\b/g)
+'coat tin food put stoop best fig_42 Pet'.match(/\b[p-z][a-z]*\b/g)
 
-'coat tin food put stoop best'.match(/\b[a-fp-t]+\b/g)
+'coat tin food put stoop best fig_42 Pet'.match(/\b[a-fp-t]+\b/g)
 
 // Negating character sets
 
 'Sample123string42with777numbers'.match(/[^0-9]+/g)
 
-'foo=42; baz=123'.replace(/^[^=]+/, '')
-
-'foo:123:bar:baz'.replace(/^([^:]+:){2}/, '')
+'apple:123:banana:cherry'.replace(/^([^:]+:){2}/, '')
 
-'foo=42; baz=123'.replace(/=[^=]+$/, '')
+'apple=42; cherry=123'.replace(/=[^=]+$/, '')
 
 let words = ['tryst', 'fun', 'glyph', 'pity', 'why']
 
@@ -46,17 +42,17 @@ words.filter(w => !/[aeiou]/.test(w))
 
 console.log('5ba\\babc2'.match(/[a\\b]+/)[0])
 
-// Escape sequence character sets
+// Escape sequence sets
 
 'Sample123string42with777numbers'.split(/\d+/)
 
 'sea eat car rat eel tea'.match(/\b\w/g).join('')
 
-'tea sea-pit sit-lean bean'.match(/[\w\s]+/g)
+'tea sea-Pit Sit;(lean_2\tbean_3)'.match(/[\w\s]+/g)
 
 'Sample123string42with777numbers'.replace(/\D+/g, '-')
 
-'   1..3  \v\f  foo_baz 42\tzzz   \r\n1-2-3  '.match(/\S+/g)
+'   1..3  \v\f  fig_tea 42\tzzz   \r\n1-2-3  '.match(/\S+/g)
 
 // Numeric ranges
 

Diff for: code_snippets/Anchors.js

@@ -4,15 +4,19 @@
 
 'breadth markedly reported overrides'.replace(/r..d/g, 'X')
 
-'42\t33'.replace(/2.3/, '8')
+'42\t35'.replace(/2.3/, '8')
 
-// split method
+'cag̈ed'.replace(/a.e/, 'o')
+
+'cag̈ed'.replace(/a..e/, 'o')
+
+// split() method
 
 'apple-85-mango-70'.split(/-/)
 
 'apple-85-mango-70'.split(/-/, 2)
 
-'bus:3:car:5:van'.split(/:.:/)
+'bus:3:car:-:van'.split(/:.:/)
 
 // Greedy quantifiers
 
@@ -44,15 +48,19 @@
 
 '3111111111125111142'.split(/1+/)
 
-let demo = ['abc', 'ac', 'abbc', 'xabbbcz', 'bc', 'abbbbbc']
+let repeats = ['abc', 'ac', 'abbc', 'xabbbcz', 'bc', 'abbbbbc']
+
+repeats.filter(w => /ab{1,4}c/.test(w))
 
-demo.filter(w => /ab{1,4}c/.test(w))
+repeats.filter(w => /ab{0,2}c/.test(w))
 
-demo.filter(w => /ab{0,2}c/.test(w))
+repeats.filter(w => /ab{3,}c/.test(w))
 
-demo.filter(w => /ab{3,}c/.test(w))
+repeats.filter(w => /ab{3}c/.test(w))
 
-demo.filter(w => /ab{3}c/.test(w))
+'a{5} = 10'.replace(/a\{5}/g, 'a{6}')
+
+'report_{a,b}.txt'.replace(/_{a,b}/g, '-{c,d}')
 
 // AND Conditional
 
@@ -74,7 +82,7 @@ patterns.every(p => p.test('dog and cat'))
 
 'foot'.replace(/f.?o/, 'X')
 
-console.log('blah < foo \\< bar < baz'.replace(/\\?</g, '\\<'))
+console.log('table < fig \\< bat < cake'.replace(/\\?</g, '\\<'))
 
 'hand handy handful'.replace(/hand(y|ful)?/g, 'X')
 
@@ -96,19 +104,13 @@ sentence.replace(/t.*a.*u/, 'X')
 
 '123456789'.replace(/.{2,5}?/, 'X')
 
-'green:3.14:teal::brown:oh!:blue'.split(/:.*?:/)
-
-let sentence = 'that is quite a fabricated tale'
-
-sentence.replace(/t.*?a/, 'X')
+'green:3.14:teal::brown:oh!:blue'.split(/:.*:/)
 
-'star'.replace(/t.*?a/, 'X')
-
-sentence.replace(/t.*?a.*?f/, 'X')
+'green:3.14:teal::brown:oh!:blue'.split(/:.*?:/)
 
 // s flag
 
-'Hi there\nHave a Nice Day'.replace(/the.*ice/, 'X')
+console.log('Hi there\nHave a Nice Day'.replace(/the.*ice/, 'X'))
 
-'Hi there\nHave a Nice Day'.replace(/the.*ice/s, 'X')
+console.log('Hi there\nHave a Nice Day'.replace(/the.*ice/s, 'X'))
 

Diff for: code_snippets/Character_class.js

@@ -1,4 +1,4 @@
-// Escaping with \
+// Escaping with backslash
 
 /b^2/.test('a^2 + b^2 - C*3')
 
@@ -64,13 +64,13 @@ p4.flags
 
 'cater cat concatenate par spare'.replace(p4, 'X')
 
-// Escaping delimiter
+// Escaping the delimiter
 
-let path = '/abc/123/foo/baz/ip.txt'
+let path = '/home/joe/report/sales/ip.txt'
 
-path.replace(/^\/abc\/123\//, '~/')
+path.replace(/^\/home\/joe\//, '~/')
 
-path.replace(new RegExp(`^/abc/123/`), '~/')
+path.replace(new RegExp(`^/home/joe/`), '~/')
 
 // Escape sequences