R help - Mar 2011 - regular expression

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

	[[alternative HTML version deleted]]

Am 31.03.2011 19:31, schrieb array chip:
> 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".
 > grep("[^(abc)]", "hello", value=T)
[1] "hello"


HTH,

Bernd