Finds elements in vector or column-names in data.frame/matrix

Pattern matching in a vector or column names of a data.frame or matrix.

Grep(x, pattern, subset = TRUE, ignore.case = TRUE, ...)

Arguments

x

vector, matrix or data.frame.

pattern

regular expression to search for

subset

If TRUE returns subset of data.frame/matrix otherwise just the matching column names

ignore.case

Default ignore case

...

Additional arguments to 'grep'

Value

A data.frame with 2 columns with the indices in the first and the matching names in the second.

See also

grep, and agrep for approximate string matching,

Author

Klaus K. Holst

Examples

data(iris)
head(Grep(iris,"(len)|(sp)"))
#>   Sepal.Length Petal.Length Species
#> 1          5.1          1.4  setosa
#> 2          4.9          1.4  setosa
#> 3          4.7          1.3  setosa
#> 4          4.6          1.5  setosa
#> 5          5.0          1.4  setosa
#> 6          5.4          1.7  setosa