Thread: Domain name from URL

Hello,

I'm fairly new to C programming and I am looking for a method to extract the domain name from a web page url.

EX. User provides http://www.google.com/index.html

I want to extract google.com from this string.

I know I can do this using regular expressions, but C doesnt seem to support Regex. Could someone give me an idea on how to handle this?

Thanks,
Kyle

Thanks a ton, this will work perfect. Could you explain the format string for me"http://%[^/]" ? I looked at the man pages for sscanf but I think your format is abit more advanced. This is a very powerful tool and I would love to be able to utilize this.

Thanks again,
Kyle

what that specifes is this

Code:

http://google.com/index.html
http:// ==> Match the literal values with the orginal string, but dont store them in domain string
[^/] ==> Read eveything but not '/' char and store the read value on to domain string

So the parser read the http:// and matched and excluded them. And it keep on reading until '/' hits. And the condition breaks and the parser quits.


ssharish

OK, I know that this is a very late "answer", but in my case it is not working.
I have the following data:

Code:

char *srv;
char *prxHostname;

srv=getenv("http_proxy");
sscanf(strcat(srv, "/"), "http://%[^/]", prxHostname);
printf("Hostname: %s\n", prxHostname);

The http_proxy variable is: http://192.168.0.10:3128
Now, whatever I do, the prxHostname is always NULL!
Any ideas why?

Originally Posted by ssharish2005

There are few issues with your code. When you concatenate the string with '/', have you made sure that serv string has enough space? And your trying to store the fetched value in prxHostname. Have you allocated enough memory before doing that. Its just a pointer but not a stirng to hold the fetchd value does it?

ssharish

EDIT: You need to open a new thread for these kind of issues, instead of reopening a thread which 3 years old!!

OK, I will open a new thread then