Increment a string with both letters and numbers

Question

I have a string which i need to increment by 1 The string has both characters and numeric values.

The string layout i have is as follows \"MD00494\"

How woul

Answer 1

I use this to Increment/Decrement Barcodes

/// 

/// Gets the number portion of the string and adds 1 to it
/// 
public static string IncrementNumbers(this string numString)
{
  if (numString.IsEmpty())
    return numString;
  else if (!numString.Where(Char.IsDigit).Any())
    return numString;
  else
  {
    string prefix = Regex.Match(numString, "^\\D+").Value;
    string number = Regex.Replace(numString, "^\\D+", "");
    int i = int.Parse(number) + 1;
    return prefix + i.ToString($"D{numString.Length - prefix.Length}");
  }
}

/// 

/// Gets the number portion of the string and subtracts 1 from it
/// 
public static string DecrementNumbers(this string numString)
{
  if (numString.IsEmpty())
    return numString;
  else if (!numString.Where(Char.IsDigit).Any())
    return numString;
  else
  {
    string prefix = Regex.Match(numString, "^\\D+").Value;
    string number = Regex.Replace(numString, "^\\D+", "");
    int i = int.Parse(number) - 1;
    return prefix + i.ToString($"D{numString.Length - prefix.Length}");
  }
}

/// 

/// Shortented IsNullOrWhiteSpace 
/// 
public static bool IsEmpty(this string str)
{
  if (str.TrimFix() == null)
    return true;

  return false;
}

/// 

/// Trims the String and returns Null if it's empty space
/// 
public static string TrimFix(this string rawString)
{
  if (!string.IsNullOrWhiteSpace(rawString))
  {
    return rawString.Trim();
  }
  return null;
}