Current Puzzle

Level Select

Regex Reference

[A-Z] Any uppercase letter
[^A] Anything but 'A'
A|B 'A' or 'B'
A* Zero or more 'A's
A+ One or more 'A's
A? Zero or one 'A'
. Any character
(AB) Group 'AB' together

Create New Puzzle

1. Enter Target Letters

Fill the grid with the solution letters (A-Z).

2. Auto-Generate Clues

Let the engine create valid regex constraints.

3. Edit Constraints

Row Regular Expressions

Column Regular Expressions

How it works

To create a valid Regex Crossword:

  1. Provide the "answer" grid first.
  2. The engine will analyze each row and column string.
  3. It generates patterns that match those strings.
  4. You can refine the generated regexes to make them harder or easier.
  5. All regexes automatically have implicit ^ and $ anchors applied during gameplay.