Re: [boost] [Regex] Avoid exceptions when using invalid regularexpressions

4 Apr 2006


      "Anne Martens" <mail@anne-martens.de> wrote in message 
news:443140C5.6020007@anne-martens.de...
...
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?
One possibility is to use a try-catch inside your function that produces 
the regex, and return optional<regex>

optional<regex> maybe_make_regex(const string &s)
{
    try {
        return regex(s);
    } catch (...) {
        return none;
   }
}

Joe Gottman