/// <summary>
/// Implementation of a method in <see cref="IFileSystem"/>
/// </summary>
/// <exception cref="NotSupportedException">Thrown if the method has not been overridden by a child class.</exception>
public virtual string[] GetFiles(string path, string searchPattern, bool topDirectoryOnly)
{
var files = GetItems(path, !topDirectoryOnly);
var matcher = new Regex(MemoryFileSystem.GetFileSearchRegex(searchPattern), RegexOptions.Compiled);
return(files.Select(x => x.Key).Where(x => matcher.IsMatch(x)).ToArray());
}