I’m trying to write a parser for URIs. I tried the grammar straight from RFC 2396

boost::regex parser("^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?",

            boost::regex::perl|boost::regex::icase);

This does not work since it I get an exception due to invalid regular expression.

I found another regular expression, which does not throw an exception but does not give me the parts of the URI using boost::match_result

boost::regex parser("(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)?/{0,2}[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?/{0,1}([0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?",

            boost::regex::perl|boost::regex::icase);

What am I doing wrong here?

Reena