### Russ Cox

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A puzzle from the MIT Mystery Hunt, for all you regular expression fans. PDF at http://www.coinheist.com/rubik/a_regular_crossword/grid.pdf﻿
104
108

Nice!

Should I worry that I a) understand what this is? b) have at least an idea about how to solve it (and can't stop working on it on my mind)? c) want to leave other boring stuff aside and solve this? :-)﻿

Having a hard time resisting the urge...﻿

Resistance is futile. Printing this now.﻿
ter nea

Give in to the "dark" side...﻿

Kinda funny you end up sharing a photo of a printout... I guess G+ doesn't have good PDF preview generation.

It was a nice puzzle for sure.﻿

he shared the printout photo because that's how he originally received the puzzle: a colleague left it on his desk. Only after sending the photo around did someone link him to the original PDF.﻿

Who's gonna be the first posting a Go program solving the puzzle?﻿

Damn! Solving it took me much more time than I initially thought it would take... but it was a fun ride. Thanks for sharing!﻿

I dont think this can be done without printing out or my brain will explode. A job for tomorrow! Looks like a good one﻿

Well, if that has to be a 'C' ... then that must be a whole row of 'C's ... so then...

SHUT UP DANIEL GO TO BED.﻿

That was fun, thanks for sharing. My regexp-skills were a bit rusty.﻿

We need more of these. Start a new trend to replace sudoku and teach unwitting non-programmers about regular expressions at the same time. ﻿

Ok so calling the number is only giving me a recorded message?﻿

I could imagine Russ cringing a little that the "regular" expression puzzle wasn't strictly regular.﻿

That was quite some fun. Are there more of those? (or a generator for puzzles)?﻿

See http://web.mit.edu/puzzle/www/huntsbyyear.html for more puzzles in general.  I don't know of any other regular expression puzzles though.﻿

Solved the logic part of it. Stuck on answer extraction.﻿

The logic is the fun part. Spoiler: Gurer vf na vaare urkntba jvgu n cuenfr nebhaq vgf obeqre. The phrase won't make much sense outside of the larger mystery hunt.﻿

- yeah, I figured it out ~20 minutes after I posted it. :)  V hfrq gung wninfpevcg-onfrq irefvba gung fbzrobql cbfgrq naq jnf zrffvat nebhaq jvgu pbybevat qvssrerag yrggre pbzovangvbaf va gur qrirybcre pbafbyr hagvy gur nafjre cbccrq bhg jvgu guvf: \$('vachg.tevq').rnpu(shapgvba(r,s) { ine \$m=\$(s); ine y=\$m.iny().gbHccrePnfr(); vs ('K'.vaqrkBs(y) != -1) { \$m.pff('onpxtebhaq', 'erq'); } ryfr { \$m.pff('onpxtebhaq', ''); } })﻿