. 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
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.
• 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
• Regex Beginner: Learn regex basics through gamification
• Skill Building: Challenge higher difficulties to solidify knowledge
• Interview Prep: Practice regex for technical interviews
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.
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.
Yes! By solving puzzles you need to understand what each regex means, naturally mastering core concepts from simple matches to complex patterns.
Three levels: Beginner (literal matches), Easy (character classes), and Intermediate (quantifiers, grouping, complex patterns).
Each cell accepts one character - typically letters, numbers, or common symbols depending on the puzzle design.