str_extract_groups() fails for U_REGEX_RULE_SYNTAX

[yutannihilation]

Probably, this is the problem about the version of libicu...?

> test_check("tiedr")
── 1. Error: str_extract_groups() works (@test-named_capture_group.R#17)  ──────
Syntax error in regexp pattern. (U_REGEX_RULE_SYNTAX)
1: expect_equal(str_extract_groups(c("a_val", "b_val"), "{name}_{value}"), tibble::tibble(name = c("a", 
       "b"), value = c("val", "val"))) at testthat/test-named_capture_group.R:17
2: quasi_label(enquo(object), label)
3: eval_bare(get_expr(quo), get_env(quo))
4: str_extract_groups(c("a_val", "b_val"), "{name}_{value}")
5: purrr::map_dfc(replacements, ~stringi::stri_replace_first_regex(x, pattern, .))
6: map(.x, .f, ...)
7: .f(.x[[i]], ...)
8: stringi::stri_replace_first_regex(x, pattern, .)

[yutannihilation]

Probably, this is the problem about the version of libicu...?

Seems my guess is right. Trusty uses ICU 52.1

https://launchpad.net/ubuntu/trusty/+source/icu

Xenial uses ICU 55.1

https://launchpad.net/ubuntu/xenial/+source/icu