class RuboCop::Cop::Style::ExactRegexpMatch


string != ‘string’
# good
string !~ /Astringz/
# bad
string == ‘string’
# good
string.match?(/Astringz/)
string.match(/Astringz/)
string === /Astringz/
string =~ /Astringz/
# bad
@example
Checks for exact regexp match inside ‘Regexp` literals.

def exact_match_pattern?(parsed_regexp) 

def exact_match_pattern?(parsed_regexp)
  tokens = parsed_regexp.map(&:token)
  return false unless tokens[0] == :bos && tokens[1] == :literal && tokens[2] == :eos
  !parsed_regexp[1].quantifier
end

def new_method(node) 

def new_method(node)
  node.method?(:!~) ? '!=' : '=='
end

def on_send(node) 

def on_send(node)
  return unless (receiver = node.receiver)
  return unless (regexp = exact_regexp_match(node))
  return unless (parsed_regexp = parse_regexp(regexp))
  return unless exact_match_pattern?(parsed_regexp)
  prefer = "#{receiver.source} #{new_method(node)} '#{parsed_regexp[1].text}'"
  add_offense(node, message: format(MSG, prefer: prefer)) do |corrector|
    corrector.replace(node, prefer)
  end
end