R/extract.R
extract.Rd
Given a regular expression with capturing groups, extract()
turns
each group into a new column. If the groups don't match, or the input
is NA, the output will be NA.
extract(data, col, into, regex = "([[:alnum:]]+)", remove = TRUE, convert = FALSE, ...)
data | A data frame. |
---|---|
col | Column name or position. This is passed to
This argument is passed by expression and supports quasiquotation (you can unquote column names or column positions). |
into | Names of new variables to create as character vector.
Use |
regex | a regular expression used to extract the desired values.
There should be one group (defined by |
remove | If |
convert | If NB: this will cause string |
... | Additional arguments passed on to methods. |
separate()
to split up by a separator.
#> A #> 1 <NA> #> 2 a #> 3 a #> 4 b #> 5 d#> A B #> 1 <NA> <NA> #> 2 a b #> 3 a d #> 4 b c #> 5 d e#> A B #> 1 <NA> <NA> #> 2 a b #> 3 a d #> 4 b c #> 5 <NA> <NA>