text: public static string Escape(string s){StringBuilder sb = new StringBuilder();for (int i = 0; i < s.Length; i++){char c = s[i];if (c == '\\' || c == '+' || c == '-' || c == '!' || c == '(' || c == ')'|| c == ':' || c == '^' || c == '[' || c == ']' || c == '\"'|| c == '{' || c == '}' || c == '~' || c == '*' || c == '?'|| c == '|' || c == '&' || c == '/'){sb.Append('\\');}sb.Append(c);}return sb.ToString();}