private Regex GetFilter(String filter, Boolean matchWholeWord = false)
{
if (filter == null)
{
filter = String.Empty;
}
if (filter.Any(character => InvalidFilterCharacters.Contains(character)))
{
throw new ArgumentException("filter contains invalid characters");
}
if (filter.Contains('/'))
{
filter = filter.Replace('/', '\\');
}
var result = default(Regex);
lock (FilterCache)
{
filter = Regex.Escape(filter).Replace("\\*", ".*").Replace("\\?", ".");
if (matchWholeWord)
{
filter = "^" + filter + "$";
}
if (!FilterCache.TryGetValue(filter, out result))
{
FilterCache[filter] = result = new Regex(filter, RegexOptions.Compiled | RegexOptions.IgnoreCase);
}
}
return(result);
}