Well, if I were going to change a batch of text files using regular expressions, I'd use the Unix program sed. Software Online has a whole suite of Unix utilities that run under Windows, which is the O/S I use now. I usually edit text files one at a time using a vi clone from the same company called Lemmy. I'm not sure what else is out there, but if you search for "regular expression" at someplace like www.download.com, I'm sure you'd come up with more options.