Problem with NSRange in Objective-C?

Question

I have a little problem with NSRange, or maybe its just the wrong comman I use.

Here is what I want to do. I have a string like this :

NSString *mystring = @"/c1blue/c2green/c3yellow/"

As you can see there is always a command with a value and that seperated by "/". Now I want to write a mthod that gives me a specific value for a command, e.g. c2 which would be green.

First I would get the position of c2 :

int beginIndex = [mystring rangeOfString:@"c2"].location;

Now I need to find the position of the "/" with the offset of 'beginIndex'.

And thats where I do not know how.

Help is hihly appreciated. Thanks

Answer 1

Another approach:

NSString *getCommand(NSString *string, NSString *identifier)
{
    for (NSString *component in [string componentsSeparatedByString:@"/"])
    {
        NSRange range=[component rangeOfString:identifier];
        if (range.location==0) {
            return [component substringFromIndex:range.length];
        }
    }
    return nil;
}

Test code:

NSString *mystring = @"/c1blue/c2green/c3yellow/";
NSLog(@"%@", getCommand(mystring, @"c2"));
NSLog(@"%@", getCommand(mystring, @"c3"));
NSLog(@"%@", getCommand(mystring, @"c4"));  

Result:

2011-01-06 15:31:13.706 so[3949:a0f] green
2011-01-06 15:31:13.711 so[3949:a0f] yellow
2011-01-06 15:31:13.712 so[3949:a0f] (null)