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digitalmars.D.learn - regex.d(339): *+? not allowed in atom

I'm using the regex module in Phobos and getting the following runtime 
exception:

regex.d(339): *+? not allowed in atom

What does that mean and what's an "atom" in this case?
I'm using DMD 2.052 on Mac OS X.

-- 
/Jacob Carlborg
Feb 20 2011