UnityVersion.cs

public struct UnityVersion
{
    public int stream;
    public int number;
    public int minor;
    public string phase;
    public int revision;

    public UnityVersion(string unityVersion)
    {
        var ms = System.Text.RegularExpressions.Regex.Matches(unityVersion, @"(\d+)|([abf])");
        try
        {
            this.stream = int.Parse(ms[0].Value);
            this.number = int.Parse(ms[1].Value);
            this.minor = int.Parse(ms[2].Value);
            this.phase = ms[3].Value;
            this.revision = int.Parse(ms[4].Value);
        }
        catch (System.Exception)
        {
            this.stream = 0;
            this.number = 0;
            this.minor = 0;
            this.phase = string.Empty;
            this.revision = 0;
        }
    }

    public override string ToString()
    {
        return $"{stream}.{number}.{minor}{phase}{revision}";
    }
}