Ruby: Comparing a string or regex with another string

In Rubocop you might notice the cop Style/CaseEquality for e.g. this example:

def foo(expected, actual)
  expected === actual
end

In case expected is a Regex, it suggests to change it to the following pattern:

def foo(expected, actual)
  expected.match?(actual)
end

In case expected is a Regex or a String, you need to keep ===. Otherwise the actual expression is always converted to a regular expression.

# For expected === actual
foo('Test(s)', 'Test(s)') #=> true

# For expected.match?(actual)
foo('Test(s)', 'Test(s)') #=> false