Help invoking a regexp

Hi I have this regular expression: (((http|https|ftp|gopher)|mailto):(//)?[^ <>"\t]*|www\.[-a-z0-9.]+)[^ .,;\t<">\):] Which is supposed to match hyperlinks. I would like to use this from php to grab all hyperlinks in a text file and return them in an array. I've messed around with the function preg_match_all() but I just can't seem to get it to work. Any suggestions would be very appreciated. Thanks, Nicklas