>
> R> as.vector(sapply(my.cache.list, function(x)strsplit(x, "\\.")[[1]][2]))
> [1] "subject_test" "subject_train" "y_test" "y_train"
>
>
> R> gsub("df\\.(.*)\\.RData", "\\1", my.cache.list)
> [1] "subject_test" "subject_train" "y_test" "y_train"
>
>
> Note that "." will match any character, while "\\." matches a period.
Thank you for your various suggestions.
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