Choose Difficulty
Game Area
📖 Regex Quick Reference
. Any single character
[abc] Any of a, b, or c
[a-z] Any from a to z
[^abc] Not a, b, or c
* Zero or more of previous
+ One or more of previous
? Zero or one of previous
{n} Exactly n of previous
{n,m} n to m of previous
^ Start $ End
| Or () Group
\\d Digit \\w Word char
What Can Regex Crossword Do?
Regex Crossword is an innovative way to learn regular expressions by combining crossword puzzles with regex patterns. Each cell needs one character, and every row and column must satisfy its corresponding regex constraint. Master core regex concepts naturally through puzzle-solving.
Core Features
• Multiple Difficulty Levels: Beginner, Easy, Intermediate - progress at your pace
• Real-time Validation: One-click check with instant feedback
• Smart Hints: Get help when stuck, no dead ends
• Regex Reference: Built-in common syntax cheat sheet
• Client-side Only: No installation needed, works offline
Use Cases
• Regex Beginner: Learn regex basics through gamification
• Skill Building: Challenge higher difficulties to solidify knowledge
• Interview Prep: Practice regex for technical interviews
FAQ
What is Regex Crossword?
Regex Crossword is a puzzle game combining crossword puzzles with regular expressions. Each cell needs one character, and every row and column must satisfy its corresponding regex constraint.
How do I play?
Fill in characters so each row matches the regex next to it, and each column matches the regex above it. All constraints must be satisfied simultaneously to win.
Can this help me learn regex?
Yes! By solving puzzles you need to understand what each regex means, naturally mastering core concepts from simple matches to complex patterns.
What difficulty levels are available?
Three levels: Beginner (literal matches), Easy (character classes), and Intermediate (quantifiers, grouping, complex patterns).
What characters can I enter?
Each cell accepts one character - typically letters, numbers, or common symbols depending on the puzzle design.