http://www.codeplex.com/BizTalkSymbolReplace
This BizTalk 2004 pipeline component works as a symbol preprocessor. (It should works to 2006 with small changes.)
I use it for EDI preprocessing.
It can change the control symbols, can use the RegExes.
Look to the comments inside the Configuration file to details.
Only setup for this component is to fill in the path to the Configuration file.
As a matter of fact I have to use the symbol preprocessr each time I work with EDI.
Please, Let me know is this component is helpfull for you or not.