[Rd] invert argument in grep

[Romain Francois]

Hello,

What about an `invert` argument in grep, to return elements that are 
*not* matching a regular expression :

R> grep("pink", colors(), invert = TRUE, value = TRUE)

would essentially return the same as :

R> colors() [ - grep("pink", colors()) ]


I'm attaching the files that I modified (against today's tarball) for 
that purpose.

Cheers,

Romain

-- 
*mangosolutions*
/data analysis that delivers/

Tel   +44 1249 467 467
Fax   +44 1249 467 468

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