Extract variable locations from unit definition

Usage

extract_variable_location(
  units,
  collapse = ";;;",
  wrap_start = "[[[",
  wrap_end = "]]]",
  missing = "___MISSING___"
)

units: Tibble. Must contain a column `definition` that contains unit definitions. Please note, that it is recommended to not extract more than 20 unit definitions at a time as the call is memory-consuming.
collapse: Character. List values will be concatenated with this character. Defaults to `";;;"`.
wrap_start: Character. List values will be wrapped with this character. Defaults to `"[[["`.
wrap_end: Character. List values will be wrapped with this character. Defaults to `"´]]]"`.
missing: Character. Placeholder for missing values. Will be transformed to `NA`. Defaults to `"___MISSING___"`.

A data frame.