Hey I need to figure out how to turn this string
"?q=cat&name=Tim#img=FunnyCat"
into the hash
({"q" => "cat", "name" => "Tim"})
I'm very much stuck on this problem any assistance would be greatly appreciated.
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1If you're using a web framework, then you're asking the wrong question because the framework likely does this for you.Mark Thomas– Mark Thomas2017-07-16 23:46:03 +00:00Commented Jul 16, 2017 at 23:46
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4 Answers
If you strip off the ? part and trim after #, then you get this:
require 'cgi'
CGI.parse("q=cat&name=Tim")
# => {"q"=>["cat"], "name"=>["Tim"]}
So pre-process with:
query = query.sub(/\A\?/, '').sub(/\#.*/, '')
Comments
I suggest you use URI.parse and CGI.parse. URI.parse will help you get the query easily, while CGI.parse will do the actual job of parsing the query and transforming it into a hash.
require 'uri'
require 'cgi'
CGI.parse(URI.parse('?q=cat&name=Tim#img=FunnyCat').query)
this will return {"q"=>["cat"], "name"=>["Tim"]}
Comments
You should use a library but here's a regex solution anyway:
str = "?q=cat&name=Tim#img=FunnyCat"
r1 = /(?<=\?).+?(?=#)/
r2 = /&|=/
str[r1].split(r2).each_slice(2).to_h
#=> {"q"=>"cat", "name"=>"Tim"}
Comments
r = /
[[:alpha:]]+ # match 1 or more letters
= # match '='
[[:alpha:]]+
(?=&) # match '&' in positive lookahead
| # or
(?<=&) # match '&' in positive lookbehind
[[:alpha:]]+
=
[[:alpha:]]+
/x # free-spacing regex definition mode
str = "?q=cat&name=Tim#img=FunnyCat"
str.gsub(r).each_with_object({}) do |s,h|
k, v = s.split('=')
h[k] = v
end
#=> {"q"=>"cat", "name"=>"Tim"}
This uses the form of String#gsub that has no block and therefore returns an enumerator. Note that no character substitutions are performed. I've found several situations where it has been helpful to use gsub in this way.
