ruby-on-rails - 正则表达式忽略以单词开头的路径或以下划线开头的文件

Question

我一直在做一个 Ruby on Rails 项目，它有贪婪的 Assets 预编译正则表达式(这对我来说是可取的，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 rails_admin插入。我需要贪婪的正则表达式来忽略 rails_admin Assets 。我开始玩弄一些 regex on Rubular但无法丢弃最后三个示例(以 rails_admin 开头的任何内容)。

我如何使用忽略所有 rails_admin Assets 和文件名以 _ 开头的 Assets 的正则表达式，但仍然抓取其他所有内容？

Answer 1

%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 中，正则表达式 ^ 和 $ 匹配 line 的开始/结束，而不是字符串，因此通常最好使用 \A 和 \z 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 开头则不是
• 如果文件名以下划线开头则不是

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