ruby - 包含撇号的 Ruby 正则表达式是什么？

Question

我目前正在为 Ruby 做一个 exercism.io，但无法通过最后一个测试。最后的测试是这样的:

def test_with_apostrophes
  phrase = Phrase.new("First: don't laugh. Then: don't cry.")
  counts = {"first"=>1, "don't"=>2, "laugh"=>1, "then"=>1, "cry"=>1}
  assert_equal counts, phrase.word_count
end

我收到的错误是:

1) Failure:
 PhraseTest#test_with_apostrophes [word_count_test.rb:61]:
 --- expected
 +++ actual
 @@ -1 +1 @@
 -{"first"=>1, "don't"=>2, "laugh"=>1, "then"=>1, "cry"=>1}
 +{"first"=>1, "don"=>2, "t"=>2, "laugh"=>1, "then"=>1, "cry"=>1}

我当前的代码是:

class Phrase
  attr_reader :input

  def initialize(input)
    @input = input
  end

  def word_count
    count = {}
    splitted = input.downcase.scan(/\w+/)
    splitted.each do | word |
    if !count.key?(word)
     count[word] = 1
    else
     count[word] = count[word] + 1
    end
  end
  count
 end
end

包含撇号的正则表达式是什么？

Answer 1

您想要使用“字符类”，如 http://www.regular-expressions.info/charclass.html 中所述.

因此，您可以使用 [\w']+ 而不是 \w+，它表示您想要一个或多个 either单词字符或撇号。