[R] regular expression

From: array chip <arrayprofile_at_yahoo.com>
Date: Thu, 31 Mar 2011 16:31:56 -0700 (PDT)


Hi, I am stuck on this: how to specify a match pattern that means not to include "abc"?

I tried:

grep("^(abc)", "hello", value=T)
should return "hello".

while

grep("^(abc)", "hello abcd foo", value=T) should return character(0).

But both returned character(0).

Thanks

John

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