What is the nicest way to parse this in C++ ?
- by ereOn
Hi,
In my program, I have a list of "server address" in the following format:
host[:port]
The brackets here, indicate that the port is optional.
host can be a hostname, an IPv4 or IPv6 address.
port, if present can be a numeric port number or a service string (like: "http" or "ssh").
If port is present and host is an IPv6 address, host must be in "bracket-enclosed" notation (Example: [::1])
Here are some valid examples:
localhost
localhost:11211
127.0.0.1:http
[::1]:11211
::1
[::1]
And an invalid example:
::1:80 // Invalid: Is this the IPv6 address ::1:80 and a default port, or the IPv6 address ::1 and the port 80 ?
::1:http // This is not ambigous, but for simplicity sake, let's consider this is forbidden as well.
My goal is to separate such entries in two parts (obviously host and port). I don't care if either the host or port are invalid as long as they don't contain a : (290.234.34.34.5 is ok for host, it will be rejected in the next process); I just want to separate the two parts, or if there is no port part, to know it somehow.
I tried to do something with std::stringstream but everything I come up to seems hacky and not really elegant.
How would you do this in C++ ?
I don't mind answers in C but C++ is prefered. Any boost solution is welcome as well.
Thank you.
