This expression will match all of the commands(escape codes) used in ANSI files. These are what were used to create the colors/blocks on BBS's for those of us that once dialed into them.
http://www.wikipedia.org/wiki/ANSI_escape_code has a reference for ANSI escape codes.
http://idledreams.net/lordscarlet/posts/153.aspx shows an example of the engine I have created surrounding the expression |