[boost] [Regex] Avoid exceptions when using invalid regular expressions

From: Anne Martens (mail_at_[hidden])
Date: 2006-04-03 11:35:33

Hi,

I'm trying to use boost-regex in my project that doesn't support 
exceptions. Thus, when constructing a regular expression with 
boost::regex expression(expr); and passig an invalid regular expression, 
my program crashes.

What can I do to make sure my regular expression is valid before passing 
it to exception-throwing methods like that one?

I already found an older answer that seems to apply to my problem 
(http://lists.boost.org/Archives/boost/2002/11/39161.php), it is 
suggested to use the member function set_expression. But how do I do 
that? I only get a lot of compiler errors.

I have the regular expression as a std::string, so I'd like to write 
something like

//string expr holds the regular expression

boost::regex expression();
int result = expression.set_expression(expr);

//check whether result is 0 -> ok.

Thanks in advance for your help!

Best regards,
Anne Martens