Web friendly file names

Hey all, I have a file uploader module that allows users to upload documents and of course people are using all kinds of file names that are not web friendly. I guess the best solution is to replace any non alphanumeric with maybe '_' the underscore? How does that sound? Unfortunately, after 20+ years of coding I cannot get my brain around regular expressions to any decent level of proficiency, I know sad. I'd like to hear other solutions for this problem, I am thinking of a regexp that replaces special chars with the underscore; sounds pretty robust and globally acceptable? Opinions, witticisms, flames, quotations by famous débutantes? (The last is optional) -- ==================================== Skip Evans Big Sky Penguin, LLC 503 S Baldwin St, #1 Madison WI 53703 608.250.2720 http://bigskypenguin.com ------------------------------------ Those of you who believe in telekinesis, raise my hand. -- Kurt Vonnegut