This is not really answering your question (especially since you're on Windows), but do you know the Unix command ident does exactly what you're after?

IDENT(1) -- 1993/11/09 -- GNU NAME ident - identify RCS keyword strings in files SYNOPSIS ident [ -q ] [ -V ] [ file ... ] DESCRIPTION ident searches for all instances of the pattern $keyword: text $ in the named files or, if no files are named, the standard input.
Certainly I have used ident successfully on binary files under Cygwin on Windows.

In reply to Re: regular expression searching in binary files by aufflick
in thread regular expression searching in binary files by dhlocker

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