using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;

public class Test
{
	private const string RegExpReplacement = "$1***$2";

	    private static readonly string[] PasswordLiterals =
	    {
	        "password",
	        "RootPassword",
	        "PassPhrase"
	    };
	
	    public static string Replace2(string sensitiveInfo)
	    {
	        var multiplePattern = $"(\"(?:{string.Join("|", PasswordLiterals)})\":\")[^\"]*(\")"; 
	        return Regex.Replace(sensitiveInfo, multiplePattern, RegExpReplacement, RegexOptions.IgnoreCase);
	    }
	    
	public static void Main()
	{
		Console.Write(Replace2("\"Password\":\"123\",\"RootPassword\":\"123qwe\",\"PassPhrase\":\"phrase\""));
	    
	}
}