过滤javascript中警告信息的特殊字符（C#）

public class RegexReplace
    {
        /// <summary>
        /// 回车 换行
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static string ReplaceText(string input)
        {
            string pattern = @"(?:\\)+(?=[rn])";
            return Regex.Replace(input, pattern, @"\");
        }

        /// <summary>
        /// 单引号
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static string ReplaceSingleQuote(string input)
        {
            string pattern = @"\\*'";
            return Regex.Replace(input, pattern, @"\'");
        }

        /// <summary>
        /// \xnn 16进制
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static string ReplaceHexXCode(string input)
        {
            string pattern = @"(\\)+x(?=$|[0-9a-fA-F]{0,1}[^0-9a-fA-F])";
            return Regex.Replace(input, pattern, @"\\x");
        }

        /// <summary>
        /// \unnnn 16进制
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static string ReplaceHexUCode(string input)
        {
            string pattern = @"(\\)+u(?=$|[0-9a-fA-F]{0,3}[^0-9a-fA-F])";
            return Regex.Replace(input, pattern, @"\\u");
        }

        /// <summary>
        /// 8进制 \0nnn
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        public static string ReplaceOctalCode(string input)
        {
            string pattern = @"(\\)+0(?=$|[0-7]{0,2}[^0-7])";
            return Regex.Replace(input, pattern, @"\\0");
        }
    }