Ruby string to array conversion

Question

I have a string that is URL encoded:

a = "%5B%22552A8619-6ECA-4A95-A798-C1E2CE75BFFF%22%2C%2264c19b5b2d0257ddb382dbd3660de3fd%22%2C%22share%22%5D"

If I URL decode this string then it will look like:

"[\"552A8619-6ECA-4A95-A798-C1E2CE75BFFF\",\"64c19b5b2d0257ddb382dbd3660de3fd\",\"share\"]"

From this string I want to get this array:

["552A8619-6ECA-4A95-A798-C1E2CE75BFFF","64c19b5b2d0257ddb382dbd3660de3fd","share"]

How to do that without nasty string replacements?

Where are you getting the string? Is it the result of some sort of a HTTP request? And, could that string be actually a JSON string? — the Tin Man
– the Tin Man, Commented Jan 22, 2013 at 22:39

sawa · Accepted Answer · 2013-01-23 00:12:02Z

3

the_given_string.scan(/"(.*?)"/).flatten

edited Jan 23, 2013 at 0:12

answered Jan 22, 2013 at 22:49

sawa

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2 Comments

JVK Over a year ago

While all other answers were correct, but I selected this because it looks very terse and works. By the way, I dont require to pass argument 1 in flatten

sawa Over a year ago

@JVK I had thought that providing the maximum depth to flatten improves the performance, but lost confidence. I just asked a question about it.

the Tin Man · Accepted Answer · 2013-01-25 06:35:42Z

3

The string is an array encoded using JSON:

require 'cgi'
require 'json'

a = "%5B%22552A8619-6ECA-4A95-A798-C1E2CE75BFFF%22%2C%2264c19b5b2d0257ddb382dbd3660de3fd%22%2C%22share%22%5D"

JSON[CGI::unescape(a)]

[
    [0] "552A8619-6ECA-4A95-A798-C1E2CE75BFFF",
    [1] "64c19b5b2d0257ddb382dbd3660de3fd",
    [2] "share"
]

JSON[CGI::unescape(a)].last will return "share", putting you home free.

CGI::escape is used to remove the encoding, which turns it back to a "normal" JSON-encoded array.

JSON[] (AKA JSON.parse) converts it from the JSON notation back to a Ruby array.

edited Jan 25, 2013 at 6:35

answered Jan 22, 2013 at 22:45

the Tin Man

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Comments

AJcodez · Accepted Answer · 2013-01-22 22:39:25Z

2

You could delete characters and split, or evaluate it:

"[\"A798-C1E2CE75BFFF\",\"643fd\",\"share\"]".delete('\"[]').split(',')
# => ["A798-C1E2CE75BFFF", "643fd", "share"]

eval "[\"A798-C1E2CE75BFFF\",\"643fd\",\"share\"]"
# => ["A798-C1E2CE75BFFF", "643fd", "share"]

answered Jan 22, 2013 at 22:39

AJcodez

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1 Comment

JVK Over a year ago

Thank you. But eval being crazy, I am hesitant to use it. First answer works.

knut · Accepted Answer · 2013-01-22 22:44:22Z

1

You could eval the string:

require 'cgi'
a = "%5B%22552A8619-6ECA-4A95-A798-C1E2CE75BFFF%22%2C%2264c19b5b2d0257ddb382dbd3660de3fd%22%2C%22share%22%5D"
x = eval( CGI.unescape(a))
p x #["552A8619-6ECA-4A95-A798-C1E2CE75BFFF", "64c19b5b2d0257ddb382dbd3660de3fd", "share"]

But eval is evil.

You could use , what you call nasty string replacement:

p CGI.unescape(a).gsub(/\A\["|"\]\Z/,'').split(/","/)

Or you could try JSON:

require 'cgi'
require 'json'
a = "%5B%22552A8619-6ECA-4A95-A798-C1E2CE75BFFF%22%2C%2264c19b5b2d0257ddb382dbd3660de3fd%22%2C%22share%22%5D"
x = JSON.load( CGI.unescape(a))

answered Jan 22, 2013 at 22:44

knut

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1 Comment

JVK Over a year ago

Thank you. You have a very comprehensive answer :)

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