Regex ile Türkçe Karakter Denetimi

Regex rgx = new Regex("(?:[^a-zA-Z0-9ğüşöçıİĞÜŞÖÇ!?.\\-*() ,<>'\":/=]| (?<=['\"])s)", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Compiled);
            string content = "";

            if (rgx.Matches(product.Content).Count < 150)
            {
                content = rgx.Replace(product.Content, String.Empty); 

            }

https://regexr.com