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Mike Haertel wrote the main program and the dfa and kwset matchers.
Arthur David Olson contributed the heuristics for finding fixed substrings
at the end of dfa.c.
Richard Stallman and Karl Berry wrote the regex backtracking matcher.
Henry Spencer wrote the original test suite from which grep's was derived.
Scott Anderson invented the Khadafy test.
David MacKenzie wrote the automatic configuration software use to
produce the configure script.
Authors of the replacements for standard library routines are identified
in the corresponding source files.
The idea of using Boyer-Moore type algorithms to quickly filter out
non-matching text before calling the regexp matcher was originally due
to James Woods. He also contributed some code to early versions of
GNU grep.
Finally, I would like to thank Andrew Hume for many fascinating discussions
of string searching issues over the years. Hume & Sunday's excellent
paper on fast string searching (AT&T Bell Laboratories CSTR #156)
describes some of the history of the subject, as well as providing
exhaustive performance analysis of various implementation alternatives.
The inner loop of GNU grep is similar to Hume & Sunday's recommended
"Tuned Boyer Moore" inner loop.
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