在 Rails 验证中计算单词 [英] Counting words in a rails validation

问题描述

我正在使用以下验证来计算 rails 中的单词数(我从 Rails 文档中得到了示例)，但这并不准确:

I'm using the following validation to count words in rails (I got the example from the Rails docs), but it's not real accurate:

validates :body, :length => {
    :minimum   => 50,
    :maximum   => 300,
    :tokenizer => lambda { |str| str.scan(/\w+/) },
    :too_short => "must have at least %{count} words",
    :too_long  => "must have at most %{count} words"
  }

一位用户试图发布 291 个字的内容(这是 Word 给出的计数)，但由于太长而被拒绝.我不知道所使用的表达方式到底有什么问题，也不知道什么是确保准确字数的好的表达方式.

A user tried to post something that's 291 words (that's the count Word gives) and it was rejected as too long. I don't know exactly what's wrong with the expression that's being used, or what might be a good expression to ensure an accurate word count.

推荐答案

你应该扫描/\s+|$/而不是扫描/\w+/并将最大值减一，因为 \w 单词字符匹配可以意外的异常字符，因为只有 A-Za-z0-9_- 有效.

Instead of scanning for /\w+/ you should scan for /\s+|$/ and decrease the max by one since the \w word character match can be unexpected with unusual characters since only A-Za-z0-9_- are valid.

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