c#转义字符串中的所有正则特殊字符方法示例

            Regex r = new Regex("[\\*\\.\\?\\+\\$\\^\\[\\]\\(\\)\\{\\}\\|\\/]");
            MatchCollection ms = r.Matches(input);
            List<string> list = new List<string>();
            foreach (Match item in ms)
            {
                if (list.Contains(item.Value))
                    continue;
                input = input.Replace(item.Value, "\\" + item.Value);
                list.Add(item.Value);
            }
            return input;
        }
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