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我一直在研究一个 Ruby on Rails 项目，该项目具有贪婪的资产预编译正则表达式（在我的情况下这是可取的，因为我不包括）：

# in config/application.rb
# this excludes all files which start with an '_' character (sass)
config.assets.precompile << /(?<!rails_admin)(^[^_\/]|\/[^_])([^\/])*.s?css$/

在同一个项目中，我使用的是rails_admin插件。我需要我贪婪的正则表达式来忽略rails_admin资产。我开始在 Rubular 上使用一些正则表达式，但无法丢弃最后三个示例（以 开头的任何内容rails_admin）。

如何使用忽略所有rails_admin 资产和文件名以 开头_但仍获取其他所有内容的正则表达式？

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1 回答 1

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%r{               # Use %r{} instead of /…/ so we don't have to escape slashes
  \A              # Make sure we start at the front of the string
  (?!rails_admin) # NOW ensure we can't see rails_admin from here 
  ([^_/]|/[^_])   # (I have no idea what your logic is here)
  ([^/]*)         # the file name
  \.s?css         # the extension
  \z              # Finish with the very end of the string
}x                # Extended mode allows us to put spaces and comments in here

请注意，在 Ruby 正则表达式中^并$匹配行的开始/结束，而不是字符串，因此通常最好使用\Aand\z来代替。

编辑：这是一个允许任何路径的修改版本：

%r{               # Use %r{} instead of /…/ so we don't have to escape slashes
  \A              # Make sure we start at the front of the string
  (?!rails_admin) # NOW ensure we can't see rails_admin from here 
  (.+/)?          # Anything up to and including a slash, optionally
  ([^/]*)         # the file name
  \.s?css         # the extension
  \z              # Finish with the very end of the string
}x                # Extended mode allows us to put spaces and comments in here

根据您的编辑和评论，这是一个匹配的正则表达式：

  • 任何以 .css 或 .scss 结尾的文件
  • 但如果路径以rails_admin
  • 而不是如果文件名以下划线开头

演示：http ://rubular.com/r/Y3Mn3c9Ioc

%r{               # Use %r{} instead of /…/ so we don't have to escape slashes
  \A              # Make sure we start at the front of the string
  (?!rails_admin) # NOW ensure we can't see rails_admin from here 
  (?:.+/)?        # Anything up to and including a slash, optionally (not saved)
  (?!_)           # Make sure that we can't see an underscore immediately ahead
  ([^/]*)         # the file name, captured
  \.s?css         # the extension
  \z              # Finish with the very end of the string
}x                # Extended mode allows us to put spaces and comments in here
于 2012-06-19T15:57:41.880 回答