View Source Credo.Check.Warning.UnusedRegexOperation (Credo v1.7.5)

Basics

This check is enabled by default.
Learn how to disable it via .credo.exs.

This check has a base priority of high and works with any version of Elixir.

The result of a call to the Regex module's functions has to be used.

While this is correct ...

def extract_username_and_salute(regex, string) do
  [string] = Regex.run(regex, string)

  "Hi #{string}"
end

... we forgot to save the downcased username in this example:

def extract_username_and_salute(regex, string) do
  Regex.run(regex, string)

  "Hi #{string}"
end

Regex operations never work on the variable you pass in, but return a new variable which has to be used somehow.

There are no specific parameters for this check.

Like with all checks, general params can be applied.

Parameters can be configured via the .credo.exs config file.