I believe that the 6th and 7th mobile puzzles are unsolvable with the provided character sets. Am I missing something?

You can scroll the letter bank. It all shows up in landscape for me, but that obscures the grid.

Ah okay, thank you. It turns out that it's possible to horizontally scroll the bank but it's very difficult to do so on my phone.

I used this site to get started with regex in 2016. Nowadays I recommend it to anybody new to regex.

It's pretty awesome, I just learned regex and found it useful

Past threads (most, but not all, from the same site):

RegEx Crossword - https://news.ycombinator.com/item?id=26439208 - March 2021 (151 comments)

Regex Crosswords - https://news.ycombinator.com/item?id=26117669 - Feb 2021 (1 comment)

Regex Crossword - https://news.ycombinator.com/item?id=20874475 - Sept 2019 (59 comments)

Regex Crossword - https://news.ycombinator.com/item?id=14715819 - July 2017 (1 comment)

Regex Cross­word - https://news.ycombinator.com/item?id=11935461 - June 2016 (1 comment)

A regex crossword from LinkedIn Engineering - https://news.ycombinator.com/item?id=11266774 - March 2016 (40 comments)

Regex Crossword - https://news.ycombinator.com/item?id=10997861 - Jan 2016 (2 comments)

Hamlet – A crossword puzzle game using regular expressions - https://news.ycombinator.com/item?id=9288605 - March 2015 (11 comments)

Regex Crossword - https://news.ycombinator.com/item?id=8682792 - Dec 2014 (2 comments)

Regex Crossword - https://news.ycombinator.com/item?id=8674039 - Nov 2014 (108 comments)

Regex crossword - https://news.ycombinator.com/item?id=6061674 - July 2013 (1 comment)

RegEx Crossword - Sudoku-like Regular Expression Puzzles - https://news.ycombinator.com/item?id=6056011 - July 2013 (11 comments)

Mystery hunt regex crossword solved in 127 lines of Haskell - https://news.ycombinator.com/item?id=5495646 - April 2013 (1 comment)

I really enjoyed these, thanks for posting.

Glad you liked it!

I only wish there were more

Yeah these are great for practice imo