x, return only the elements that do
not satisfy a particular regular expression statement;
ie, remove all elements that are matched by
pattern.ngrep(pattern, x, ...)x that did not match the pattern
suppliedgrep returns the location
of matches, rather than the actual matches themselves.
ngrep only returns matched elements, not the
location of matches.grep regexsome_files <- c("output_file.tar.gz", "old_log1.txt", "old_log2.txt")
## get the non-log files
files_I_want <- ngrep( "_log[0-9]+\\.txt$", some_files )Run the code above in your browser using DataLab