macOS how to validate a website in a textfiled?

[rethish]

-(IBAction)webid)sender
{

NSString *web =[[NSString alloc]initWithString:[webfield stringValue]];


NSString *webRegEx = @"www.[A-Z0-9a-z._%+-]+.[a-z]{2,4}";

NSPredicate *webTest = [NSPredicate predicateWithFormat"SELF MATCHES %@",webRegEx];



if ([webTest evaluateWithObject:web] == YES)
{

[NSApp beginModalSessionForWindow:valid];
[webfield web:sender];

}

else
{
[NSApp beginModalSessionForWindow:notvalid];
[webfield setStringValue""];
[webfield web:sender];

}
}



when this code is used www.hai.com , wwwww.fff.com , wwwfghw.hai.com , these format are shown valid and also the letter 'w' can used any number of times and also other letters are also accepted .

I need a standard format ie: www.hhhh.com , the w should appear only three times otherwise it must not be valid.


How can it be poosible ? please help
thakyou

 

[Guiyon]

I need a standard format ie: www.hhhh.com , the w should appear only three times otherwise it must not be valid.


How can it be poosible ? please help
thakyou

The problem is, a site may not have a 'www' and still be valid, or it may have www1, www2, etc. so building your own check will be a mess of regexes (and it's re-inventing the wheel); even your example of "wwwfghw.hai.com" is perfectly valid. The say the easiest thing to do would be using the NSURL class to check the format. the +(id)URLWithString: method will return nil if you pass it a malformed url and non-nil if the passed string is a correctly formed url. This way you could then use the newly created class to extract out the specific information you need.