将 Ruby 正则表达式拆分为多行

发布于 2024-09-24 12:06:57 字数 212 浏览 3 评论 0原文

这可能不是您所期待的问题！我不想要一个能够匹配换行符的正则表达式；相反，我想编写一个很长的正则表达式，为了便于阅读，我想将其拆分为多行代码。

比如：

"bar" =~ /(foo|
           bar)/  # Doesn't work!
# => nil. Would like => 0

可以做到吗？

原文

This might not be quite the question you're expecting! I don't want a regex that will match over line-breaks; instead, I want to write a long regex that, for readability, I'd like to split onto multiple lines of code.

Something like:

"bar" =~ /(foo|
           bar)/  # Doesn't work!
# => nil. Would like => 0

Can it be done?

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故乡的云 2024-10-01 12:06:57

将 %r 与 x 选项一起使用是执行此操作的首选方法。

请参阅 github ruby 样式指南

regexp = %r{
  start         # some text
  \s            # white space char
  (group)       # first group
  (?:alt1|alt2) # some alternation
  end
}x

regexp.match? "start groupalt2end"

https:// github.com/github/rubocop-github/blob/master/STYLEGUIDE.md#regular-expressions

Using %r with the x option is the prefered way to do this.

See this example from the github ruby style guide

regexp = %r{
  start         # some text
  \s            # white space char
  (group)       # first group
  (?:alt1|alt2) # some alternation
  end
}x

regexp.match? "start groupalt2end"

https://github.com/github/rubocop-github/blob/master/STYLEGUIDE.md#regular-expressions

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梦亿 2024-10-01 12:06:57

您需要使用 /x 修饰符，它启用自由间距模式< /a>.

在你的情况下：

"bar" =~ /(foo|
           bar)/x

You need to use the /x modifier, which enables free-spacing mode.

In your case:

"bar" =~ /(foo|
           bar)/x

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凑诗 2024-10-01 12:06:57

我建议不要切割正则表达式中间表达式，而是将其分成几部分：

full_rgx = /This is a message\. A phone number: \d{10}\. A timestamp: \d*?/

msg = /This is a message\./
phone = /A phone number: \d{10}\./
tstamp = /A timestamp: \d*?/

/#{msg} #{phone} #{tstamp}/

我对长字符串执行相同的操作。

Rather than cutting the regex mid-expression, I suggest breaking it into parts:

full_rgx = /This is a message\. A phone number: \d{10}\. A timestamp: \d*?/

msg = /This is a message\./
phone = /A phone number: \d{10}\./
tstamp = /A timestamp: \d*?/

/#{msg} #{phone} #{tstamp}/

I do the same for long strings.

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