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Hi there,
Do you have any ideas about how to construct a simple URL checker ? Not one that actually checks server side to see whether or not the domain name actually exists.
User must enter something like www.domain_name.com
At its simplest level is it sufficient to check that two periods have been etered ?
I am not looking for source code !
:)
regards,
bigSteve
Tricky, this is valid and only has one dot
http://motherboards.org/
hmmmmm regular expression comes to my mind...
Doesn't the boost library have a regex library? An english teacher at my school who progams has been telling me all year to learn regular expressions, they do seem to come in handy.
unanimous replied:
Doesn't the boost library have a regex library?
What does this sentence mean ?
bigSteve
Boost is a C++ library located at Boost.org. Its a very good andvery useful library and the creators are trying to make it part of the new C++ standards if I remember correctly. Regex is the abbreciated form of regular expressions which vasanth mentioned earlier.
Checking for two periods is redundant, since sub-domains (which www is) don't validate domain names.
I guess, logically, it might be done as such:
- Locate the end of the TLD (which would be either a forward-slash (domain.com/index.html), or nothing (domain.com));
- Check every character up-until is valid (i.e. no spaces, etc.);
Thanks for all your suggestions,
bigSteve
Well this on another wave length then what you were going for, but if you have an active connection and wanted to see if the URL was valid, try making a connection to it, not visible mind you... and then check the host response.. kinda like using sockets...
Safe Coding...
It would be far quicker and resource friendly to check for invalid characters prior to resolving.
Yhea your correct it would not be friendly, but it is the only true way to make sure a URL is valid. But if you just want to check URL syntax then you can.. It was an idea... not a perfect resolution.