((comment) @injection.content
  (#set! injection.language "comment"))

((call_expression
  .
  (_) @_fnname
  .
  "("
  .
  (_
    [
      (string_content)
      (raw_string_content)
    ] @injection.content)
  .
  ")")
  (#any-of? @_fnname "compile" "regex::compile")
  (#set! injection.language "regex"))