=~ 和/\ 在 Ruby 中是什么意思?

问题描述

我一直在自学 Ruby，对于我试图解决的某个问题，我注意到很多人在他们的代码中使用 =~ 和 /\代码.我不太确定它们是如何工作的，只是想要一个解释.例如，我正在查看这个 Pig Latin 翻译器的代码，这是我第一次看到这些代码被使用.

I've been teaching myself Ruby and for a certain problem I'm trying to solve I notice a lot of people are using =~ and /\ in their code. I'm not really sure how they work and would just like an explanation. For example I was looking at someones code for this Pig Latin translator and this is the first time I'm seeing these being used.

def piglatin(word)
   if word =~ (/\A[aeiou]/i)
      word = word + 'ay'
   elsif word =~ (/\A[^aeiou]/i)
      match = /\A[^aeiou]/i.match(word)
      word = match.post_match + match.to_s + 'ay'
   end
word
end

我只是对 /\ 斜杠和 =~

推荐答案

=~ 被称为匹配运算符"，可用于将字符串与正则表达式进行匹配.

=~ is known as the "match operator" and can be used to match a string against a regular expression.

/\ 实际上是两个独立事物的一部分./ 表示正则表达式的开头，\A 被称为锚点"，表示从字符串的开头匹配".

The /\ is actually part of two separate things. / denotes the start of a regular expression and \A is known as an "anchor" and is saying "match from the beginning of the string."

这是一个文档链接，可以帮助您理解更多像您发布的代码.

感谢 Wayne Conrad 对/\"的更正

thank you to Wayne Conrad for a correction on '/\'

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