Cross both clues
Select a cell to see its across and down regex. The correct letter lies in the intersection of both rules.
Regex Crossword
A mobile-first regex crossword with 120 unique-solution levels, daily puzzles, live conflict feedback, sound effects, and account-free URL challenges.
Make every row and column match its regex clue. Cross both constraints to determine each unique letter across 120 progressive puzzles.
Level 5
⏱ 0:00
→ Across 1
^CA[CA]$↓ Down 1
^[^B].C$Select a cell, then enter a letter that satisfies both its across and down regex clues.
Moves 0🧩 All regex clues
R1^CA[CA]$
R2^B.B$
R3^(?:A|C)BC$
C1^[^B].C$
C2^[^C]A(?:A|B)$
C3^C[^A][BC]$
YouToStem · Strategy
📘 Regex Crossword Strategy Guide
Read character sets
[ABC] allows A, B, or C; [^A] excludes A; a dot . accepts any available letter.
Place literal letters first
A plain letter must appear exactly as written. Fill literals first, then narrow the neighboring cells.
Validate one line at a time
A completed non-matching line is highlighted. Correct a crossing cell to repair two clues at once.
❓ Regex Crossword FAQ
How do you play Regex Crossword?
Every cell belongs to one across regex and one down regex. Choose letters so every completed row and column fully matches its clue.
Is it suitable for regex beginners?
Yes. The first 30 levels introduce literals, dots, and simple character sets before later stages add negated sets and grouped alternatives.
Does every puzzle have a unique answer?
Yes. The generator intersects the across and down candidates for every cell and guarantees that only the target letter remains. All 120 levels are automatically verified.
What does a red cell mean?
The current letter is not allowed by both crossing clues. Correcting that cell can repair its row and column together.
Is the daily challenge the same for everyone?
Everyone receives the same date-seeded puzzle and clue set on a given day, followed by a new puzzle the next day.
Do shared challenges require an account?
No. The URL encodes the puzzle seed, move count, and time so a friend can open and play the exact same puzzle.
Can I play on mobile and with a keyboard?
Yes. Mobile players get large letter controls; desktop players can type letters, navigate with arrow keys, and erase with Backspace.
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