Extract version number from string

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Hi all,

if i pass a string (verstring == "vername.1.19.5") it will return the version because i am ignoring Currentver[0]. if i want to pass verstring == "1.19.5".

I mean i will get verstring in both formats with version name(vername) or only version(1.19.5)

C#

public VerInfo(string verString)
        {
            string[] currentVer;

            if (versionString.Contains("."))
                currentVer= versionString.Split(".".ToCharArray());
            else
                currentVer= versionString.Split(":".ToCharArray());

            a= Convert.ToByte(currentVer[1]);
            b= Convert.ToByte(currentVer[2]);
            c= Convert.ToByte(currentVer[3]);
        }

What I have tried:

I have tried using the string length, here string length vary's

if (versionString.Length > 5)

Posted 9-Mar-17 10:06am

Member 12277263

Updated 9-Mar-17 18:44pm

CPallini

v2

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2 solutions

Solution 3

Hi Member 12277263,

Your problem is basically to understand if currentVer[0] is a string ('vername') or not, and according to that parse the rest of the version information.

A quick workaround is:

1) Check if the first index is a string ('vername').
2) According to that set the parsing index starter - if it should start from 0, or 1.

public void VerInfo(string verString)
{
    string[] currentVer;

    if (verString.Contains("."))
        currentVer = verString.Split(".".ToCharArray());
    else
        currentVer = verString.Split(":".ToCharArray());

    int Index = 0;
    if (currentVer[0].ToLower().Equals("vername"))
        Index = 1;
    else Index;

    byte a = Convert.ToByte(currentVer[Index++]);
    byte b = Convert.ToByte(currentVer[Index++]);
    byte c = Convert.ToByte(currentVer[Index]);
}

You can further refine the IF-ELSE statement by replacing with ternary operator. I didn't do that for sake of clarity.

Posted 9-Mar-17 18:44pm

Mehedi Shams

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CPallini · Accepted Answer · 2017-03-09T10:49:00

You could use regular expressions, via the Regex class.
Try, for instance

C#

public static void Main()
{
  string[] verstring = new string[] { "vername.1.19.5", "1.19.5" };

  Regex r = new Regex(@"(?:vername\.?:)?(\d+)\.(\d+)\.(\d+)");
  for (int n = 0; n < 2; ++n)
  {
    System.Console.Write("Input string: '{0}', extracted numbers: ", verstring[n]);
    Match m = r.Match(verstring[n]);
    if (m.Success)
    {
      for (int i = 0; i < 3; ++i)
        System.Console.Write("'{0}' ", m.Groups[i + 1].Captures[0]);
      System.Console.WriteLine();
    }
  }
}

Output:

Input string: 'vername.1.19.5', extracted numbers: '1' '19' '5' 
Input string: '1.19.5', extracted numbers: '1' '19' '5'