How to check the capital letter?
If you don't want to mess around with NSCharacterSet and NSScanner,
you could also do this:
NSString *string = @"abcABC";
NSUInteger index = 0; // The character at this index will be checked
NSString *character = [string substringWithRange:NSMakeRange(index, 1)];
NSLog(@"is uppercase: %i", [character isEqualToString:[character
uppercaseString]]);
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