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

Assuming that you only need to increment the numeric portion of the string, and that the structure of the strings is always - bunch of non-numeric characters followed by a bunch of numerals, you can use a regular expression to break up the string into these two components, convert the numeric portion to an integer, increment and then concatenate back.

var match = Regex.Match("MD123", @"^([^0-9]+)([0-9]+)$");
var num = int.Parse(match.Groups[2].Value);

var after = match.Groups[1].Value + (num + 1);

Answer 2

Here's my solution:

string str = Console.ReadLine();
string digits = new string(str.Where(char.IsDigit).ToArray());
string letters = new string(str.Where(char.IsLetter).ToArray());
string newStr;
int number;

if (!int.TryParse(digits, out number)) 
{
  Console.WriteLine("Something weird happened");
}
if (digits.StartsWith("0"))
{
  newStr = letters + (++number).ToString("D5");
}
else
{
  newStr = letters + (++number).ToString();
}

Try it!