字符串轉換爲數組中的Ruby on Rails的

Question

我有串：

str = "[[591, 184] , [741, 910] , [987,512], [2974, 174]]" 

我想將其轉換爲一個數組：

arr = [[591, 184] , [741, 910] , [987,512], [2974, 174]] 

我怎樣才能做到這一點？

Answer 1

一個JSON解析器應該很好地工作：

require "json" 

str = "[[591, 184] , [741, 910] , [987,512], [2974, 174]]" 
p JSON.parse(str) 
# => [[591, 184], [741, 910], [987,512], [2974, 174]] 

嘗試在eval.in：https://eval.in/777054

Answer 2

您必須使用 「EVAL」：

> str = "[[591, 184] , [741, 910] , [987,512], [2974, 174]]" 
# => "[[591, 184] , [741, 910] , [987,512], [2974, 174]]" 
> arr = eval str 
# => [[591, 184], [741, 910], [987, 512], [2974, 174]] 

Answer 3

一種方式做此：

str = "[[591, 184] , [741, 910] , [987,512], [2974, 174]]" 
reg = /(?<=\[)[\d,?\s?]+(?=\])/ 
str.scan(reg).map { |s| s.scan(/\d+/).map(&:to_i) } 
#=> [[591, 184], [741, 910], [987, 512], [2974, 174]] 

或採取葉出@喬丹的書，但使用YAML：

require 'yaml' 
str = "[[591, 184] , [741, 910] , [987,512], [2974, 174]]" 
YAML.load(str) #=> [[591, 184], [741, 910], [987, 512], [2974, 174]] 

Answer 4

我會split和scan分兩步進行。

str = "[[591, 184] , [741, 910] , [987,512], [2974, 174]]" 

str.split(/\]\s*,\s*\[/).map { |s| s.scan(/\d+/).map(&:to_i) } 
    #=> [[591, 184], [741, 910], [987, 512], [2974, 174]] 

注意

str.split(/\]\s*,\s*\[/) 
    # => ["[[591, 184", "741, 910", "987,512", "2974, 174]]"]