Fork, C# - rextester

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using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;
public class GameVars{
	public struct Var {
		public string Name {get; private set;}
		public string Value {get; private set;}
		/// <summary>
        /// Constructor for Var
        /// </summary>
        /// <param name="s">name of var</param>
        /// <param name="value">default value of var</param>
        public Var(string s, string value):this() {
            this.Name = s;
            this.Value = value;
        }
		public void Change(string v){
			Console.WriteLine(@"[ERROR]Changing value from """+Value+@""" to """+v+@""".");
			this.Value = v;
			Console.WriteLine(@"[ERROR]Result: """+Value+@"""");
		}
	}
	private List<Var> vars;
	public string this[string s]{
		get { return vars.Find(e => e.Name == s).Value; }
		set {
			Console.WriteLine(@"[ERROR]Attempt to change value of """+s+@""" to """+value+@""".");
			if( vars.Find(e => e.Name == s).Name != null )
				vars.Find(e => e.Name == s).Change(value);
			else
				vars.Add(new Var(s, value));

Console.WriteLine(@"Result: """+this[s]+@"""");
			if( this[s] != value )
				throw new System.Exception("Not changed!");
		}	
	}
	
	public GameVars(){
		vars = new List<Var> {
			new Var("endl", "\n\r"),
			new Var("$", "\\$")
		};
	}
	
	public void LoadFromFile(string str) {
			// TODO: Parse Config String
			/*
				"<ident>":"<value>";
			*/
			string varMatch = @"(?<e1>""|'|`)(?<ident>(?:.(?!\k<e1>))*.)\k<e1>:(?<e2>""|'|`)(?<value>(?:.(?!\k<e2>))*.)\k<e2>;";
			MatchCollection matches = Regex.Matches(str, varMatch);
			foreach( Match m in matches ) {
				string ident = m.Groups["ident"].Value ?? "$";
				string value = m.Groups["value"].Value ?? "undefined";
				if( ident == "$" || string.IsNullOrWhiteSpace(str) ) {
					Console.WriteLine(@"Variable identificator is illegal! " + m.Groups["ident"]);
					return;
				}
				Console.WriteLine(@"Changed """+ident+@"""("+(this[ident] ?? "null")+@", "+(this.vars.Find(e=>e.Name==ident).Name??"null")+@") to: """+ value +@""" .");
				this[ident] = value;

}
		}
	
}
namespace Rextester{
    public class Program
    {
        public static void Main(System.String[] s)
        {
            GameVars gv = new GameVars();
            gv.LoadFromFile(@"""version"":""beta 0.0.0..1"";");	// Startup.cfg
            gv.LoadFromFile(@"""version"":""beta 0.0.0.1"";");	// Version.cfg	this should override previous one.
        }
    }
}

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Compilation time: 0,16 sec, absolute running time: 0,2 sec, cpu time: 0,2 sec, average memory usage: 23 Mb, average nr of threads: 5, absolute service time: 0,4 sec