regular expression question

Dear R People:

I have a data frame with the following column names:

names(funky)

[1] "UHD.1"   "UHD.2"   "UHD.3"   "UHD.4"   "L..W..1" "L..W..2" "L..W..3"
 [8] "L..W..4" "B..W..1" "B..W..2" "B..W..3" "B..W..4" "W..B..1" "W..B..2"
[15] "W..B..3" "W..B..4" "B..G..1" "B..G..2" "B..G..3" "B..G..4"


I would like to extract the letters from them; no periods, no numbers.

I tried the following:

grep("[A:Z]",names(funky))

integer(0)

But this doesn't do it.

I've also been experimenting with strsplit, but no luck yet.

Any help would be much appreciated.

Thanks,
Sincerely,
Erin

Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodgess at gmail.com