Ruby 正则表达式组存储在变量中？

发布于 2024-11-17 06:22:11 字数 689 浏览 7 评论 0原文

我对这个正则表达式有问题，它似乎没有抓住标题（最后一个 '.' 之后的所有内容）我已经在多个源上测试了正则表达式，它们似乎都抓住了正确的分组。是不是我的扫描功能做错了？

##### data.csv file #####
## Web_Sites.Shopping.Newegg,...
## Web_Sites.Shopping.Newegg_Secure,...
## Web_Sites.Shopping.O'Reilly_Books,...
## Web_Sites.Shopping.PackageTrackr,...
#####

## Grab the title from the list
regex = '([\w_-]+)$'

## Open the CSV File
data_file = CSV.open("data.csv", "r")

## Set the file we will append the data.
my_file = File.new("titles.csv", 'a')

## For each line in the data file, get the correct title
data_file.each do |data|
   note = data[0]
   title = note.scan(regex)
   my_file.print "#{note} : #{title}"
end

谢谢你，
低频4

原文

I'm having issues with this regex it doesn't seem to grab the titles (everything after the last '.' ) I've tested the regex on multiple sources and they all seem to grab the correct grouping. Is it something with the scan function that I am doing wrong?

##### data.csv file #####
## Web_Sites.Shopping.Newegg,...
## Web_Sites.Shopping.Newegg_Secure,...
## Web_Sites.Shopping.O'Reilly_Books,...
## Web_Sites.Shopping.PackageTrackr,...
#####

## Grab the title from the list
regex = '([\w_-]+)
Thank you,

LF4


## Open the CSV File
data_file = CSV.open("data.csv", "r")

## Set the file we will append the data.
my_file = File.new("titles.csv", 'a')

## For each line in the data file, get the correct title
data_file.each do |data|
   note = data[0]
   title = note.scan(regex)
   my_file.print "#{note} : #{title}"
end

Thank you,
LF4

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稍尽春風 2024-11-24 06:22:11

您没有提供扫描正则表达式参数，您给它一个纯字符串，并且字符串 '([\w_-]+)$' 可能不会出现在 note 中的任何位置，因此扫描 没有做任何有用的事情。您想要使用 Regexp 类来创建和存储正则表达式：

regex = Regexp.new('([\w_-]+)
或者（谢谢 Kudo）您可以使用正则表达式文字形式之一：
regex = /([\w_-]+)$/
regex = %r{([\w_-]+)$}

然后传递 Rexexp到 note.scan：
note.scan(regex)

)

或者（谢谢 Kudo）您可以使用正则表达式文字形式之一：

然后传递 Rexexp到 note.scan：

You're not giving scan a regular expression argument, you're giving it a plain string and the string '([\w_-]+)$' probably doesn't appear anywhere in your note so scan doesn't do anything useful. You want to use the Regexp class to create and store your regular expression:

regex = Regexp.new('([\w_-]+)
Or (thankyou Kudo) you could use one of the regex literal forms:
regex = /([\w_-]+)$/
regex = %r{([\w_-]+)$}

And then pass that instance of Rexexp to note.scan:
note.scan(regex)

)

Or (thankyou Kudo) you could use one of the regex literal forms:

And then pass that instance of Rexexp to note.scan:

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