unvigrep | R Documentation |
case-insensitive grep, returning unmatched values
unvigrep(..., ignore.case = TRUE, value = TRUE, invert = TRUE)
... , ignore.case , value , invert |
parameters sent to |
This function is a simple wrapper around base::grep()
which
runs in case-insensitive mode, and returns unmatched values.
It is mainly used to save keystrokes,
but is consistently named alongside vgrep
and
vigrep
, and quite helpful for writing concise code.
It is particularly useful for removing unwanted entries from a long
vector, for example removing accession numbers from a long
vector of gene symbols in order to review gene annotations.
vector of non-matching indices
Other jam grep functions:
grepls()
,
igrepHas()
,
igrepl()
,
igrep()
,
provigrep()
,
unigrep()
,
vgrep()
,
vigrep()
V <- paste0(LETTERS[1:5], LETTERS[4:8]);
unigrep("D", V);
igrep("D", V);
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