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A comment on Welcome, cryptanalyst.

Re:Welcome, cryptanalyst by TrainedMonkey on Tuesday November 25, 2014 @03:17PM (#8659466)
This is entrance to foobar. It is pretty easy to figure out crossword using either a calculator to convert bases or (wolfram alpha for the lazy) and [0] for regex. I have not used regex in years, but got in easy.

[0] http://www.regexr.com/ . Hint mouse over regex after you type it for explanation of what will match, try it out in the text editor below. Fairly trivial.

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Re:Welcome, cryptanalyst by delluminatus on Tuesday November 25, 2014 @05:51PM (#8660256)
Semi-related, Google does base conversions too. You can type "8660 in hexadecimal" in Google and get the answer. Seems strangely appropriate since this is a Google game.
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Re:Welcome, cryptanalyst by vnagpal on Tuesday November 25, 2014 @03:21PM (#8659483)
all is trivial but regex, what data to use for those hints ?
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Re:Welcome, cryptanalyst by TrainedMonkey on Tuesday November 25, 2014 @03:38PM (#8659574)
It does not really matter. Either characters to use would be included in regex itself, such as [j-g] or you could use any.

For example "\D{2}\S{3}" means match 2 non-digit characters followed by 3 nonspace characters. Some things that match "aaaaa", "bbbbb", "ALUSD", "AA123"...

Site I linked really explains things quite well on mouseover. Once you complete first challenge (make sure you open this in chrome, I've had exciting quest of delete elements in firefox until I could save my solution) you can register and come back anytime later.

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