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What flavor of GREP is used in PowerFind Pro?

Is there documentation of the GREP syntax that is more complete than the documentation in the NWP user guide?

(I realize there are numerous websites with GREP documentation and tutorials, but I'm looking for documentation of the exact flavor of GREP used in NWP.)

Thanks!

That is oniguruma whose syntax is documented in
http://www.geocities.jp/kosako3/oniguruma/doc/RE.txt

[edit] Basically it is the same as that of Perl 5.8.x although not all the experimental features are supported and there are some additions and modifications.

Thanks very much, Kino-san!

I'm glad you added the reference to Perl. Perl 5.8.1 has a man page PERLRETUT that is much more detailed than the man page for Oniguruma. In particular, it explained look-ahead ?= and look-behind ?<=, which I had not seen explained elsewhere.