.NET + Sphinx. How not to escape # and @?

Question

Sphinx

I am using MySqlCommand to connect. I form the text of the request to the Sphinx according to the following template:

"select Id, WEIGHT() as weight from ind WHERE MATCH ('"+ searchString + "')"

The user can enter the characters # and @ and the exception will fly out. To avoid this, I escape these characters:

searchString.Replace("@","\\\\@").Replace("#", "а")

Is there a more generic solution?
What other characters need to be escaped?

Answer 1

the correct solution is to skip only allowed characters at the
same time with the regexp and you can translate to lower case

Answer 2

all special characters must be escaped, for this there are ready-made functions in all languages