ruby - 如何引用ruby正则表达式

Question

我要转换字符串:

"{john:123456}" 

到:

"<script src='https://gist.github.com/john/123456.js'>"

我写了一个可行的方法，但它非常愚蠢。是这样的:

def convert
    args = []

    self.scan(/{([a-zA-Z0-9\-_]+):(\d+)}/) {|x| args << x}  

    args.each do |pair|
       name = pair[0]
       id = pair[1]
       self.gsub!("{" + name + ":" + id + "}", "<script src='https://gist.github.com/#{name}/#{id}.js'></script>")
    end 

    self
end

有没有办法像下面的cool_method那样做到这一点？

"{john:123}".cool_method(/{([a-zA-Z0-9\-_]+):(\d+)}/, "<script src='https://gist.github.com/$1/$2.js'></script>")

Answer 1

那个很酷的方法是 gsub。你离得太近了!只需将 $1 和 $2 更改为\\1 和\\2

http://ruby-doc.org/core-2.0/String.html#method-i-gsub

"{john:123}".gsub(/{([a-zA-Z0-9\-_]+):(\d+)}/, 
  "<script src='https://gist.github.com/\\1/\\2.js'></script>")