grepal
returns a vector of colors whose names match a regular expression (regex).
grepal(pattern, x = colors(), ignore_case = TRUE)
pattern | A regular expression (specified as a string/character object). |
---|---|
x | A vector of R color names or a data frame of named colors
(i.e., whose names can be searched).
Default: |
ignore_case | Should the case of pattern be ignored
(passed to |
By default, the base R vector of named colors (i.e., colors()
) is searched
for names matching a pattern
(which can be a simple string or regular expression).
If x
(i.e., the object to be searched) is provided,
it is must be a vector of color names or a data frame of named color objects
(i.e., a color palette).
This function facilitates searching colors by name and
yields (a vector of) colors of similar color hue (provided
that the color's hue is expressed in a color's name).
Its name grepal
is an abbreviation of grep
and "pal".
seepal
to plot color palettes;
usecol
to use a color palette;
defpal
to define new color palettes;
shades_of
to define shades of a given color;
pal_unikn
for the default uni.kn color palette.
Other color functions:
newpal()
,
seecol()
,
shades_of()
,
usecol()
grepal("cyan")#> [1] "cyan" "cyan1" "cyan2" "cyan3" "cyan4" #> [6] "darkcyan" "lightcyan" "lightcyan1" "lightcyan2" "lightcyan3" #> [11] "lightcyan4"# With regular expressions: some_grey <- grepal("gr(a|e)y") start_grey <- grepal("^gr(a|e)y") only_grey <- grepal("^gr(a|e)y$") length(some_grey)#> [1] 224#> [1] 2# With other color objects (df as x): grepal("blau", x = pal_unikn)#> seeblau5 seeblau4 seeblau3 seeblau2 seeblau1 #> 1 #008ECE #00A9E0 #59C7EB #A6E1F4 #CCEEF9grepal("SEE", x = pal_unikn_pref)#> Seeblau Seegruen #> Seeblau #59C7EB #0A9086olives <- grepal("olive") oranges <- grepal("orange") seecol(list(olives, oranges), pal_names = c("olives", "oranges"), title = "Comparing olives and oranges")