Java

I enjoyed this kata since I'm a big fan of regular expressions, But it's more suited at 5kyu instead of 4.

That was fun :-)

Ruby version kumited, please check and comment or approve.

Which language did you solve in?

There is a strange requirement: "true123 is an identifier, as opposed to boolean followed by integer".. Looks like foreign for this task. Actually I ignored it (did not check and maintain this case). And my solvation passed all tests! May be you should remove this requirement from kata description?

Oh, you are right.

... yielding Token items until there are no more items to yield, at which point it should do whatever the appropriate action is for your chosen language.

I don't know Java, but a quick search reveals that next() should throw an exception when there's nothing more to return. Since this is the official spec of the interface, I'd say it's rather more obvious than not.

To pass "testException" in Java you have to throw an exception in "next()" if the string is empty, which is not obvious. Returning null or new Token(null, null) in "next()" or false in "hasNext()" doesn't work.

approved

Rust translation ready for review.

Also (probably) needs new fixed tests to match new spec.

Also (probably) needs improved fixed tests to match new spec.

You seem to have outdated sample tests. You can either:

• Reset the trainer (removes your code, so save it)
• Ignore the sample tests and just hit "attempt"

I have gathered input and tuned the details of my fork, then went ahead and approved it.

• The description is now updated for all languages.
• Python has new fixed tests and added random tests and will probably invalidate a few solutions
• Other languages need to be updated and brought into alignment, but they already have separate issues.