regkata

Master Regular Expressions Through Practice

Learn regex the way martial artists learn moves—through deliberate practice and progressive challenges.

npm install -g regkata

Then start training:

regkata

Why regkata?

Regular expressions are powerful but intimidating. Most tutorials throw syntax at you and hope it sticks. regkata takes a different approach: learn by doing.

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22 Progressive Lessons

From fundamentals to real-world applications, master regex step by step

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Real-time Validation

Test your regex against multiple cases instantly with immediate feedback

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Progress Tracking

Pick up exactly where you left off, skip completed lessons

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Hint System

Stuck? Type ? for guidance on any lesson

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Beautiful CLI

Clean, colorful interface built with React and Ink

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Lightning Fast

What You'll Learn

⬜ White Belt - Fundamentals

Master the core regex patterns and syntax

1. Literal Characters → Match exact text

2. The Dot Metacharacter → Match any character

3. Character Classes → Match sets of characters

4. Character Ranges → Match ranges like [0-9]

5. Negated Character Classes → Match anything BUT these

6. Shorthand Character Classes → \\w, \\d, \\s shortcuts

7. The Plus Quantifier → Match one or more

8. The Star Quantifier → Match zero or more

9. The Question Mark → Make optional

10. Anchors - Start → ^ matches string start

11. Anchors - End → $ matches string end

12. Word Boundaries → \\b matches word edges

13. Alternation → Match this OR that

14. Grouping → Combine patterns

15. Escaping Special Chars → Match literal . ? * etc.

🟨 Yellow Belt - Real World

Apply regex to practical challenges and data extraction

16. Extract IPv4 Addresses → Parse server logs

17. Extract Email Addresses → Find emails in text

18. Extract URLs → Match HTTP/HTTPS links

19. Parse Dates → MM/DD/YYYY format

20. Extract Phone Numbers → US XXX-XXX-XXXX format

21. Extract Hashtags → Social media tags

22. Parse Hex Colors → #RGB and #RRGGBB

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