Ruby - 如何將單行換行改爲雙行換行？

Question

比方說，我有這樣的一個叫做「道」文件：

If you can talk about it, it ain't Tao. If it has a name, it's just another thing.   
Tao doesn't have a name. Names are for ordinary things. 

而且我想在Ruby中打開它，並將其更改爲：

If you can talk about it, it ain't Tao. If it has a name, it's just another thing. 
  
Tao doesn't have a name. Names are for ordinary things. 

我知道如何閱讀文件，並獲取內容到一個字符串（我們稱之爲tao_string），但我不知道如何將單行換行改爲雙行換行。我懷疑是通過正則表達式，但我不知道從哪裏開始。

Answer 1

你可以用gsub做到這一點：

tao_string2 = tao_string.gsub("\n", "\n\n") 

或就地與gsub!：

tao_string.gsub!("\n", "\n\n") 

這將通過雙換行符替換字符串中的所有換行符。