c# Regex.Replace

Question

I have the following method that is replacing a "pound" sign from the file name but I want also to be able to replace the "single apostrophe ' " at the same time. How can I do it? This is the value of filename =Provider license_A'R_Ab#acus Settlements_1-11-09.xls

static string removeBadCharPound(string filename)
{            // Replace invalid characters with "_" char.            
    //I want something like this but is NOT working 
    //return Regex.Replace(filename, "# ' ", "_");
    return Regex.Replace(filename, "#", "_");
 }

Answer 1

Try

return Regex.Replace(filename, "[#']", "_");

Mind you, I'm not sure that a regex is likely to be faster than the somewhat simpler:

return filename.Replace('#', '_')
               .Replace('\'', '_');

Answer 2

And just for fun, you can accomplish the same thing with LINQ:

var result = from c in fileName
             select (c == '\'' || c == '#') ? '_' : c;
return new string(result.ToArray());