[boost] Re: Regex

From: Lucas Galfaso (lgalfaso_at_[hidden])
Date: 2004-09-11 08:15:52

"John Maddock" <john_at_[hidden]> wrote in message 
news:025a01c497f8$8134eef0$fce30352_at_fuji...
>> 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 it.
> 3) The smatch object should be untouched after the above exception is 
> thrown, that's hardly "crash and burn".
>

I think that the behavior you specify is perfect, unfortunate this is not 
true with VC 6.0

Lucas/

> John.
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