[R] grep searching for sequence of 3 consecutive upper case letters

[Lapointe, Pierre]

Hello,

I need to identify all elements which have a sequence of 3 consecutive upper
case letters, anywhere in the string.

I tested my grep expression on this site: http://regexlib.com/RETester.aspx

But when I try it in R, it does not filter anything.

str <-c("AGH", "this WOUld be good", "Not Good at All")
str[grep('[A-Z]{3}',str)] #looking for a sequence of 3 consecutive upper
case letters

[1] "AGH"                "this WOUld be good" "Not Good at All"   

Any idea?

Pierre

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