How to find if NSString has specific characters

 NSCharacterSet * set = [[NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ"] invertedSet];

    

    if ([strValue rangeOfCharacterFromSet:set].location == NSNotFound) 

        NSLog(@"character found");

    else

        NSLog(@"no character found");

Code above will find out whether NSString strValue has characters from set (abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ) . You can create your own own characters set with any values like even special characters(? >  etc).