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