The author encourages something like: Regex::new(r"\bstruct\b").some_custom_function_that_calls_expect() or Regex::new_or_panic(r"\bstruct\b") // Just calls

The author encourages something like: Regex::new(r"\bstruct\b").some_custom_function_that_calls_expect() or Regex::new_or_panic(r"\bstruct\b") // Just calls Regex::new(r"\bstruct\b").expect("bad regex string literal")