Splitting Text files

[Ken Seergobin]

"William Park" <opengeometry at NOSPAM.yahoo.ca> wrote in message
news:aft0r5$go61b$3 at ID-99293.news.dfncis.de...

> Perhaps, you should remove 'X-No-Archive'.  Most people won't give
answers,
> let alone reply, to such posts.

Personally, I'm not thrilled by every scrap of information being recorded.
However, if the no-archive option makes getting information easier the
content of the original post will be repeated in this message.  (That said,
I do understand why posts like these should be archived.)

Original Post:

I've looked around, but have been unable to locate a
good example of how to split a text file.  Specifically,
I have datafiles with an identification line marked
with the name of a BMP  file followed by many lines of
data.  This repeats a number of times for each datafile.
Within the data lines I'm only interested in extracting the
those with a specific keyword.  Ultimately, I'd like to have
a datafile for each BMP listed in the original file.

Suggestions would be appreciated.  I really couldn't make
sense of the regular expression notes I found.

Thanks,
Ken