R help - Jan 2014 - use grep in lists and vectors

Hello,

I want to detect Ab not Abc. For a normal vector
test
[1] "A"   "Ab"  "GG"  "GA" 
"H"   "Abc" "Gz"  "HU"
> grep ("^Ab$", test)
[1] 2

works well.

For
 test.list
[[1]]
[1] "A"  "Ab" "GG" "GA"

[[2]]
[1] "H"   "Abc" "Gz"  "HU"

grep ("^Ab$", test.list)
integer(0)

doest not work.

Why?
How do I detect exclusively Ab in a list context?
Thanks hermann

> dput (test.list)
list(c("A", "Ab", "GG", "GA"),
c("H", "Abc", "Gz", "HU"))

> dput (test)
c("A", "Ab", "GG", "GA", "H",
"Abc", "Gz", "HU")

	[[alternative HTML version deleted]]