Re: [Boost-users] boost::regex_match throws exception

From: John Maddock (john_at_[hidden])
Date: 2007-07-31 04:43:08

mildaiv_at_[hidden] wrote:
> I build boost::regex 1.34 using Borland BDS 2006.
> Simple regular expresions works fine, but I have problem with this
> regular expresion:
> ^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)+$
> if a try to match it with any string longer then 22 bytes, regex
> throws exception.
> After some investigations i simplified regular expresion to
> ^[10+]*@$
> and it still throws exception

I can't reproduce with Boost-1.34: please post a complete self contained 
test case.  Also make sure that those \'s are double escaped if they're 
embedded in code:

boost::regex 
e("^[_a-zA-Z0-9-]+(\\.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-]+(\\.[a-zA-Z0-9-]+)+$");

Otherwise the expression does something rather different, and *will* get 
pathological and throw an exception.

HTH, John.