Question

NSString *url = @"http://stackoverflow.com/questions/ask";

How can I get the character position of the 4th “/” ?

Answer 1

If you’re just trying to get the last part of the url, you should be able to use this:

NSArray* items = [url componentsSeparatedByString:@"/"];

To get the index of the last ‘/’ character:

NSRange range = [url rangeOfString:@"/" options:NSBackwardsSearch];

get the index value from range.location

To find the index of the fourth ‘/’ character from the url:

int count = 0;
int index = -1;
for (unsigned int i=0; i < [url length]; ++i) {
    if ([url characterAtIndex:i] == '/') {
        ++count;
        if (count == 4) {
            index = i;
            break;
        }
    }
}