using System;

using System.Text;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        string input = "title:\"News\" AND (createdby:\"Leoul\" OR createdby:\"Upas\") AND someothermanagedprop:\"something\"";

        string[] splitInputs = input.Split(new string[] { " AND " }, StringSplitOptions.None);

        bool isValidInput = true;

        foreach (string splitInput in splitInputs)

        {

            Console.WriteLine(splitInput);

            bool isValidMatch = IsValidMatch(splitInput);

            isValidInput &= isValidMatch;

            Console.WriteLine("IsValidMatch: " + isValidMatch);

        }

        Console.WriteLine(isValidInput);

    }

    public static bool IsValidMatch(string splitInput)

    {

        string[] patterns = new string[]

        {

            "(createdby:\\\"(?<createdby>.*?)\\\"( OR )?)",

            @"^title:""(?<title>(.*))""$"

        };

        foreach (string pattern in patterns)

        {

            if (IsValidMatchForPattern(pattern, splitInput))

            {

                return true;

            }

        }

        return false;

    }

    public static bool IsValidMatchForPattern(string pattern, string splitInput)

    {

        Regex rgx = new Regex(pattern);

​

        MatchCollection matches = rgx.Matches(splitInput);

        if (matches.Count > 0)

        {

            foreach (Match match in matches)

            {

                Console.WriteLine(match.Groups[0]);

                Console.WriteLine(match.Groups[1]);

                Console.WriteLine("matched title: " + match.Groups["title"]);

                Console.WriteLine("matched createdby: " + match.Groups["createdby"]);

            }

​

            return true;

        }

​

        return false;

    }

}