Return an empty string as the only 'example' for an empty regex

Author: tom-lord

lib/regexp-examples/parser.rb

@@ -29,7 +29,7 @@ def initialize(regexp_string, regexp_options)
  end
 
  def parse
- repeaters = []
+ repeaters = [PlaceHolderGroup.new]
  until end_of_regexp
  group = parse_group(repeaters)
  return [group] if group.is_a? OrGroup

spec/regexp-examples_spec.rb

@@ -261,6 +261,10 @@ def self.examples_are_empty(*regexps)
  )
  end
 
+ context 'for empty regex' do
+ it { expect(//.examples).to eq [''] }
+ end
+
  context 'for comment groups' do
  examples_exist_and_match(
  /a(?#comment)b/,