>> mywords<- c("harry","met","sally","subway10","1800Movies","12345", "not
>> correct 123")
>> all.letters <- grep("^[[:alpha:]]*$", mywords)
>> all.numbers <- grep("^[[:digit:]]*$", mywords) # numbers
>> mixed <- grep("^[[:digit:][:alpha:]]*$", mywords)
mywords<- c("harry","met","sally","subway10","1800Movies","12345",
"not correct 123", "")
mywords[grepl("^[[:digit:][:alpha:]]*$", mywords)]
So maybe you should use
mywords[grepl("^[[:digit:][:alpha:]]+$", mywords)]
And grepl is highly recommended over grep.
Hadley
--
http://had.co.nz/
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