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From: John Maddock (john_at_[hidden])
Date: 2004-09-11 07:11:39

> What should be the behavior of a regex::smatch whenever the
> regex::expression you are trying to match is not a well formed regex
> expression?
> With the current implementation is crush and burn. I do not know what is
> boost policy on this matter, but I think this is not desirable.

1) If you try and compile an invalid expression you get a
boost::bad_expression exception thrown, it's up to you to handle it.
2) If you pass an invalid (or empty) regular expression object to one of the
regex algorithms, then that's a (documented) precondition failure, and you
get a std::invalid_argument exception thrown, and it's up to you to handle
3) The smatch object should be untouched after the above exception is
thrown, that's hardly "crash and burn".


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