Simple Grep Command?

[Newbie407]

I'm new to Grep.  I'm using Text Wrangler.

I want to search an entire doc for a pattern.  If I find that pattern, I
want to do a search and replace within the pattern, then keep looking for
the pattern again.

Specifically, I'm looking for the letters "LEC" followed by variable text
and ending with either a carriage return or the letters "ulty."  If I find
it, I want to change all the space characters within the found string into
something else, say "zzzz."  

I can figure out how to find the pattern, and I can figure out how to make
the replacement, but I can't figure out how to do it within the pattern
only.

Thanks!
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