find.names: Search for names

In common: Solutions for Common Problems in Base R

Search for names

Description

A function to search for variable names in a data.frame or tibble. The function features wild card pattern matching, start and end boundaries, and names to exclude.

Usage

find.names(
  x,
  pattern = NULL,
  exclude = NULL,
  start = NULL,
  end = NULL,
  ignore.case = TRUE
)

Arguments

x	A data frame or tibble whose names to search. Parameter also accepts a character vector of names.
pattern	A vector of patterns to search for. The asterisk (*) and question mark (?) characters may be used to indicate partial matches.
exclude	A vector of patterns to exclude from the search results. The asterisk (*) and question mark (?) characters may be used to indicate partial matches.
start	A variable name or position to start the search. Default is 1.
end	A variable name or position to end the search. Default is the length of the name vector.
ignore.case	Whether to perform a case sensitive or insensitive search. Valid values are TRUE and FALSE. Default is TRUE.

Value

A vector of variable names that met the search criteria.

Examples

# Show all names for reference
names(mtcars)
#  [1] "mpg"  "cyl"  "disp" "hp"   "drat" "wt"   "qsec" "vs"   "am"   "gear" "carb"

# Names that start with "c"
find.names(mtcars, "c*")
# [1] "cyl"  "carb"

# Names that start with "c" or "d"
find.names(mtcars, c("c*", "d*"))
# [1] "cyl"  "carb" "disp" "drat"

# Names between "disp" and "qsec"
find.names(mtcars, start = "disp", end = "qsec")
# [1] "disp" "hp"   "drat" "wt"   "qsec"

# Names that start with "c" or "d" after position 5
find.names(mtcars, c("c*", "d*"), start = 5)
# [1] "carb" "drat"

# Names between "disp" and "qsec" excluding "wt"
find.names(mtcars, start = "disp", end = "qsec", exclude = "wt")
# [1] "disp" "hp"   "drat" "qsec"

common documentation built on May 29, 2024, 1:48 a.m.