using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var tags = new [] {"a","b","c"};

        var search = new [] {"b"};

        var isMatch1 = tags.Any(x => search.Contains(x));

        var isMatch2 = tags.Intersect(search).Any();

        var isMatch3 = tags.ContainsAny(search);

        Console.WriteLine(isMatch1);

        Console.WriteLine(isMatch2);

        Console.WriteLine(isMatch3);

        var str = "hello world";

        var words = new [] {"world", "earth", "terra"};

        var contains1 = words.Any(w => str.Contains(w));

        var contains2 = str.ContainsAny(words);

        Console.WriteLine(contains1);

        Console.WriteLine(contains2);

    }

}

​

​

public static class StringExtensions

{

    /// <summary>

    /// Tests whether any of the entries in the search list can be found in the source string

    /// </summary>

    public static bool ContainsAny(this string source, IEnumerable<string> search)

    {

        return search.Any(source.Contains);

    }

}

​

public static class LinqExtensions

{

    /// <summary>

    /// Tests whether the source list matches any of the values in the search list

    /// </summary>

    public static bool ContainsAny<T>(this IEnumerable<T> source, IEnumerable<T> search)

    {

        return source.Any(search.Contains);

    }

}