It is indeed machine-solvable; I wrote a solver for regexcrossword.com puzzles a while back (https://github.com/hermanschaaf/regex-crossword-solver https://gith

It is indeed machine-solvable; I wrote a solver for regexcrossword.com puzzles a while back (https://github.com/hermanschaaf/regex-crossword-solver https://github.com/hermanschaaf/regex-crossword-solver). It was great fun, maybe even more than solving the puzzles by hand!