This probably doesn't belong in Ruby Core. I was reading this article:
http://swtch.com/~rsc/regexp/regexp1.html
http://swtch.com/~rsc/regexp/regexp2.html
http://swtch.com/~rsc/regexp/regexp3.html

And in the first few lines of the first page, it shows that the Regexp
implementation for Perl is absolutely terrible, and it says that Ruby is
"the same" or at least similar. Is Ruby 1.8 / 1.9 using the Thompson NFA
matching? Will Ruby 2.0 use it?
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