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by Daniel Finnie

Today's quiz would've been most useful in elementary school, where over half of
the homework assignments were word search puzzles. The concept of these puzzles
is simple enough that an elementary school student could understand it:  given a
box of letters, find a line containing the letters of a specified word in order.

For example, find the words ruby, dan, rocks, and matz in the following text:

U E W R T R B H C D
C X G Z U W R Y E R
R O C K S B A U C U
S F K F M T Y S G E
Y S O O U N M Z I M
T C G P R T I D A N
H Z G H Q G W T U V
H Q M N D X Z B S T
N T C L A T N B C E
Y B U R P Z U X M S

The correct answer in the correct output format:

+ + + R + + + + + +
+ + + + U + + + + +
R O C K S B + + + +
+ + + + + + Y + + +
+ + + + + + + + + M
+ + + + + + + D A N
+ + + + + + + T + +
+ + + + + + Z + + +
+ + + + + + + + + +
+ + + + + + + + + +

Notice that the words can go backwards and diagonally, and can intersect one
another. Searching is case insensitive.

The word search solver should accept input entered by the user after running the
program, i.e., not exclusively through STDIN or a file, by entering the puzzle
line by line, pressing return after each line. A blank line indicates the end of
the puzzle and the start of the comma separated words to find. The following
example shows how a user would enter the above puzzle, with descriptive text
from the program removed.

\$ ./wordsearch.rb
UEWRTRBHCD
CXGZUWRYER
ROCKSBAUCU
SFKFMTYSGE
YSOOUNMZIM
TCGPRTIDAN
HZGHQGWTUV
HQMNDXZBST
NTCLATNBCE
YBURPZUXMS

Ruby, rocks, DAN, matZ

Now, by itself, this quiz is fairly simple, so I offer an additional challenge.
Write a beautiful, extensible, and easily-modifiable program without looking at
the extra credit before starting. When you're done, try implementing extra
credit options using less than 5 or 6 (reasonable) lines of code.

* An output format superior to the one given. The output format given
should remain the default unless both formats don't differ on a
textual basis. That should sound cryptic until pondered, I can't
give too much away!
* Allow for "snaking" of answers, in other words, the letters
composing a word don't have to be in a straight line.
* An option to give a hint, i.e., "The word ruby traverses the bottom