Ruby字符串操作对捕获的组不起作用

Question

此字符串替换有效:

"reverse, each word".gsub(/(\w+)/, "\\1a")
=> "reversea, eacha worda"

和这样,单引号基本相同:

"reverse, each word".gsub(/(\w+)/, '\1a')
=> "reversea, eacha worda"

但如果我试图反转字符串,它会失败:

"reverse, each word".gsub(/(\w+)/, "\\1a".reverse)
=> "a1\\, a1\\ a1\\"

我玩过它,但似乎无法让相反的操作起作用.

Answer 1

我一直碰到这个.块捕获组在块范围内可用,因此重写如下:

"reverse, each word".gsub(/(\w+)/) { |match| $1.reverse + "a" }

或者由于您的匹配是组,您可以完全省略该组

"reverse, each word".gsub(/\w+/) { |match| match.reverse + "a" }