C# regular Expressions

Question

I have a regular expression like 

 

 tempString = Regex.Replace(tempString, @"[^a-zA-Z0-9\. \\/:*-\[\]]", "");

 

first "tempString" is assigned a value "français (France)"  but after executing below mentioned expression the value got changed to "fran?ais France"

 

so i want to retain the original string that assigned initially aven after executing the below expression .

 

So ahat should be the modifiction to be done on that expression for retaining all characters in my string?