User to enter only one decimal dot in to the text field for price

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

    

    NSError *error;

    NSRegularExpression * regExp = [[NSRegularExpression alloc]initWithPattern:@"^\\d{0,6}(([.]\\d{1,2})|([.]))?$" options:NSRegularExpressionCaseInsensitive error:&error];

    

    NSString * existingText = textField.text;

    NSString * completeText = [existingText stringByAppendingFormat:@"%@",string];

    

    if ([regExp numberOfMatchesInString:completeText options:0 range:NSMakeRange(0, [completeText length])])

    {

        if ([completeText isEqualToString:@"."])

            [textField insertText:@"0"];

        return YES;

    }

    else

        return NO;

    

   }