gistfile1.cs

        // no perl - just simple Aho-Corasick implementation
        private static string CleanInput(string badString)
        {
            CharReplacement[] replacements = new[] 
            {
                new CharReplacement() { GoodChar = (char) 39,
                    BadChars = new[] { (char) 96, (char) 8216, (char) 8217, (char) 8242, (char) 769, (char) 768 } 
                },
                new CharReplacement() { GoodChar = (char) 34,
                    BadChars = new[] { (char) 8220, (char) 8221, (char) 8243, (char) 12291 } 
                },
                new CharReplacement() { GoodChar = (char) 32,
                    BadChars = new[] { (char)160, (char)8195, (char)8194 } 
                },
                new CharReplacement() { GoodChar = (char) 45,
                    BadChars = new[] { (char)8208, (char)8211, (char)8212, (char)8722, (char)173, (char)8209, (char)8259 } 
                }
            };
            // from:http://www.codeproject.com/KB/recipes/ahocorasick.aspx
            // but TURN OFF caching in app domain in it's implementation
            IList<EeekSoft.Text.StringSearch> searchers = new List<EeekSoft.Text.StringSearch>();

            foreach (var item in replacements)
            {
                var searcher = new EeekSoft.Text.StringSearch();
                IList<string> keywords = new List<string>();
                foreach (var keyword in item.BadChars)
                {
                    keywords.Add(Convert.ToString(keyword));
                }
                searcher.Keywords = keywords.ToArray();
                searchers.Add(searcher);
            }

            StringBuilder sb = new StringBuilder(badString);

            for (int i = 0; i < searchers.Count; i++)
            {
                var results = searchers[i].FindAll(badString);
                foreach (var result in results)
                {
                    sb[result.Index] = replacements[i].GoodChar;
                }
            }
            return sb.ToString();
        }