Why does tidyr extract not respect the ignore_case flag?

Question

I would excpect that I can pass a regex to tidyr's extract and set the ignore_case to true. But it does not work apparently:

tidyr::extract(
  tibble("Value"),
  col = 1,
  into = c("result"),
  regex = regex("(value)", ignore_case = TRUE)
)

This should result in a tibble with one column result and one row with value Value. But it does not, the cell is NA.

With a capital letter, the same code works:

tidyr::extract(
  tibble("Value"),
  col = 1,
  into = c("result"),
  regex = regex("(Value)", ignore_case = TRUE)
)

Passing ignore_case = TRUE or ignore.case = TRUE directly as an argument to extract does not solve the problem.

No idea what's going on, but `regex = regex("(?i)(value)")` works. — Wiktor Stribiżew, Jun 20 '19 at 15:24
The `regex` function is from a different package, **stringr**. I haven't dug into the code much, but it's likely that tidyr functions simply weren't written to use that special function from another package. — joran, Jun 20 '19 at 15:26
[Here is a solution](https://stackoverflow.com/a/9655203/3832970). — Wiktor Stribiżew, Jun 20 '19 at 15:36
You can check the github issue related to this post https://github.com/tidyverse/tidyr/issues/223 — akrun, Jun 20 '19 at 17:15

score -1 · Accepted Answer · answered Jun 20 '19 at 15:34

-1

Thx wiktor, that works indeed:

tidyr::extract(
  tibble("Value"),
  col = 1,
  into = c("result"),
  regex = "(?i)(value)"
)

answered Jun 20 '19 at 15:34

benjazehr

1 Answers1