[burke]

Ruby 1.8.7 does too. Not sure about Oniguruma in 1.9

https://github.com/ruby/ruby/blob/ruby_1_8_7/regex.c#L2751-2...

EDIT: Looks like 1.9 does too:

https://github.com/ruby/ruby/blob/ruby_1_9_2/regint.h#L281