using System;

using System.Text.RegularExpressions;

public class Program

{   

    private static void Test(string text) {

        Regex rxItem = new Regex("{\"cid\":\"(\\w*)\",\"uid\"", RegexOptions.Compiled | RegexOptions.IgnoreCase);

        Match matchItem = rxItem.Match(text);

        if (matchItem.Success) Console.WriteLine("Success! Company Id is: " +  matchItem.Groups[1].Value);

        else Console.WriteLine("OOPS! No match!");

    }

    public static void Main() {

        Program.Test("{\"cid\":\"TheCompanyId\",\"uid\":\"TheUserId\"}");

        Program.Test("{\"uid\":\"TheUserId\",\"cid\":\"TheCompanyId\"}");

        Program.Test("{\"cid\":\"The$CompanyId\",\"uid\":\"TheUserId\"}");

        Program.Test("{\"cid\":\"TheCompany@Id\",\"uid\":\"TheUserId\"}");

    }

}