Not sure if I would recommend this approach for engineers of Burj Khalifa, tho :)

congrats on 2 dan, mate :)

Nice twist on "fast" and "speed" in given examples :)

you need to include some test cases for boundaries after the word..
repeating submit for a couple of times let me through by checking just before..
for example ("a abc", "abca abc" => false, while "abca a", "abca abc" => true)

was going to say the same, would be handy like in python, for example ;)

props for the creativity ;)

Please update desc that there will always be ONE number and always IN THE END of the string,
so user will not be tested for these -> foo99bar99, fooba99r.

Otherwise, great kata ;)

Needs more tests on 3X3 blocks, awesome kata otherwise ;)

part2 would be interesting with whole numbers shuffled, f.e. range 15-19, there are 1916181517 not 8961171511 :)

Actually this was the first kata I came across asking for that, so props for uniqueness ;)
Always loved challanges with creative twists and cleverly tested edge cases ;)

great twist with test for mutations ;)

regex is awesome :)

Awesome kata, props to author for making this (y) ;)

small, simple and neat ;)