src/tools/clippy/src/docs/trivial_regex.txt

   1 ### What it does
   2 Checks for trivial [regex](https://crates.io/crates/regex)
   3 creation (with `Regex::new`, `RegexBuilder::new`, or `RegexSet::new`).
   4
   5 ### Why is this bad?
   6 Matching the regex can likely be replaced by `==` or
   7 `str::starts_with`, `str::ends_with` or `std::contains` or other `str`
   8 methods.
   9
  10 ### Known problems
  11 If the same regex is going to be applied to multiple
  12 inputs, the precomputations done by `Regex` construction can give
  13 significantly better performance than any of the `str`-based methods.
  14
  15 ### Example
  16 ```
  17 Regex::new("^foobar")
  18 ```