regular expression in iOS

Question

I am looking for a regular expression to match the following -100..100:0.01. The meaning of this expression is that the value can increment by 0.01 and should b

Answer 1

          if(val>= -100 && val <= 100)
    {
        NSString* valregex = @"^[+|-]*[0-9]*.[0-9]{1,2}"; 
        NSPredicate* valtest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", valregex]; 
        ret = [valtest evaluateWithObject:txtLastname.text];
        if (!ret)
        {
            [alert setMessage:NSLocalizedString(@"More than 2 decimals", @"")];
            [alert show];       
        }
    }

works fine.. Thnx for the efforts guys !