using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
 
public class Program
{
	public static void Main()
	{
		string source = "חָזִיתִי כְּמִבַּעַד לֶעָשָׁן בְּקִמּוּרֵי הָרֶסֶס הַלָּבָן";
		Dictionary<char, char[]> exclude = new Dictionary<char, char[]>
		{
			{'\u05db', new char[] {'\u05bc' } }, // כּ
			{'\u05d1', new char[] {'\u05bc', '\u05b7' } }, // בַּ
		};
		string replaced = RemoveDiacritics(exclude, source);
		Console.WriteLine(replaced);
	}
	public static string RemoveDiacritics(Dictionary<char, char[]> exclude, string source)
	{
		string exclusionGroup = string.Join("|", exclude.Select(p => string.Concat(p.Key, string.Join(string.Empty, p.Value))));
		string leaveOnly = String.Concat(String.Format(@"({0})|\p{{M}}+", exclusionGroup));
		return Regex.Replace(source, leaveOnly, "$1");
	}
}

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