Complete Regular Expressions Tutorial! (with exercises for practice)

Publié le: 13 avril 2023
sur la chaîne: Keith Galli

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In this video we go through all the fundamentals of using regular expressions (regexes) to match patterns in programming.

In this video we cover the following:
Character Sets [a-zA-Z0-9]
Quantifiers *, +, ?, {3,5}
Metacharacters ^ . | $
Character Classes \b \s \w \d
Groups
Lookahead & Lookbehind assertions
and more!

There is a detailed timeline down below.

In a future video we will apply what we learn in this one to the Python programming language (re library) -- subscribe to not miss that!

Resources!
Source code & txt files: https://github.com/keithgalli/regular...
Practice exercise video:    • Practice Regular Expressions with Regex Golf!
Cheat sheet: https://cheatography.com/davechild/ch...
Regex golf: https://alf.nu/RegexGolf
Javascript Info: https://javascript.info/regexp-lookah...

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Video timeline!
0:00 - Video overview & topics covered
1:43 - Basic regex syntax (building up an intuition)
4:23 - Character Sets Overview ([A-Za-z0-9])
5:57 - Quantifiers Guide (*, +, ?, {3,5})
9:30 - Guided Exercise: Find all words that don't use vowels
11:08 - Helpful cheat sheet to remember regex syntax in the real-world
12:47 - Matching words/patterns of a specific length ({3,5})
14:58 - OR operator overview
17:14 - Guided Exercise: Match valid sentences (starts with capital letter, ends with period)
21:18 - Character classes overview (\w, \b, \d, \s)
23:13 - Escaping Characters
25:02 - Practice Exercise #1: Write a regular expression to match meme text format
30:39 - Practice Exercise #2: Write a regular expression to match a specific date format
39:03 - Groups overview
50:16 - Lookahead & Lookbehind Assertions
1:00:18 - Practice Exercise #3: Detect if same word pops up multiple times in a sentence
1:06:04 - Practice Exercise #4: Password matching with rules
1:16:16 - Some final recommendations! (additional practice, chatgpt, etc.)

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