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Regular Expression Puzzle Solver Output
$ ghc recross.hs && ./recross
[2 of 2] Compiling Main ( recross.hs, recross.o )
Linking recross ...
Iteration 0
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Iteration 1
* * * * E * *
M * * * * * * *
* M * * . * . * H
H * M * * * * * * H
H * * M . * * * X D C
* * * * M * * * H D * C
* * * * * M . . C R . R G
* M * M * * * R * R * *
* O . * . * . . X R N
* M * M * * * E * R
P O . * . * X * V
* * * * * M * *
* * F * M C *
Iteration 2
* E C * E * *
M L R C R L * C
* M X O X R X M H
H E M H E * H E * H
H H X M I R H H X D C
* * R * M * * H H D D C
* * X M C M . E C R X R G
A M * M M C M R C R C R
H O X M . C . * X R N
E M N M N C * E C R
P O . O . C X R V
H I * * C M * O
N D F M M C H
Iteration 3
S E C U E M C
M L R C R L M C
M M X O X R X M H
H E M H E M H E M H
H H X M I R H H X D C
H P R R M I O H H D D C
S * X M C M I E C R X R G
A M * M M C M R C R C R
H O X M M C C O X R N
E M N M N C R E C R
P O . O X C X R V
H I * M C M R O
N D F M M C H
Iteration 4
S E C U E M C
M L R C R L M C
M M X O X R X M H
H E M H E M H E M H
H H X M I R H H X D C
H P R R M I O H H D D C
S T X M C M I E C R X R G
A M A M M C M R C R C R
H O X M M C C O X R N
E M N M N C R E C R
P O X O X C X R V
H I O M C M R O
N D F M M C H
Done!
dmcardle commented Feb 4, 2014

I hoped there would be a secret message in the answer.

BE SURE TO DRINK
YOUR OVALTINE

There is a secret message in the answer:

      . . . . . . .
     . . . . . . . . 
    . . X O X R X . . 
   . . M . . . . E . . 
  . . X . . . . . X . . 
 . . R . . . . . . D . . 
. . X . . . . . . . X . . 
 . . A . . . . . . R . . 
  . . X . . . . . X . . 
   . . N . . . . E . .  
    . . X O X C X . . 
     . . . . . . . . 
      . . . . . . . 

Taking the conspicuous ring matching /(.X)*/ and passing it through sed 's_\(.\)X_\1_g' gets you "ARMORED RECON" (space inserted for clarity).

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