在rails上将字符串转换为数组[复制]

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Convert string into Array in rails 3 answers
在rails 3答案中将字符串转换为数组

I am having string:

我有字符串：

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

I want to convert this to an array:

我想将其转换为数组：

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

How can i do this?

我怎样才能做到这一点？

4 个解决方案

#1

A JSON parser ought to work fine:

JSON解析器应该正常工作：

require "json"

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

Try it on eval.in: https://eval.in/777054

在eval.in上试试：https：//eval.in/777054

#2

One way to do this:

一种方法：

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]]

or taking a leaf out of @Jordan's book, but using YAML:

或者从@Jordan的书中拿出一片叶子，但是使用YAML：

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

#3

I would split and scan in two steps.

我会分两步拆分和扫描。

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]]

Note that

注意

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

#4

You have to use "eval":

你必须使用“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]]

#1