Strip special characters (including spaces) from a string using Regex

This is the regex I use to convert a free text value to a filename style value (used in my CMS to create a filename based on a page title):

string cleanName = new Regex(“\W”).Replace(uncleanName, “”)

e.g: new Regex(“\W”).Replace(“page & title $ with %bad characters!!”, “”) = “pagetitlewithbadcharacters”