Question

i have this string:
“asdasda=asdaskdmasd&asmda=asdasmda&ACK=Success&asdmas=asdakmsd&asmda=adasda”

i want to get the value after between the ACK and the & symbol, the value between the ACK and the & symbol can be changed…

thanks

i want the solution in ruby.

Answer 1

require "cgi"

query_string = "asdasda=asdaskdmasd&asmda=asdasmda&ACK=Success&asmda=asdakmsd"
parsed_query_string = CGI.parse(query_string)
#=> { "asdasda" => ["asdaskdmasd"],
#     "asmda" => ["asdasmda", "asdakmsd"],
#     "ACK" => ["Success"] }

parsed_query_string["ACK"].first
#=> "Success"

If you also want to reconstruct the query string (especially together with the rest of a URL), I would recommend looking into the addressable gem.

require "addressable/uri"

# Note the leading '?'
query_string = "?asdasda=asdaskdmasd&asmda=asdasmda&ACK=Success&asmda=asdakmsd"
parsed_uri = Addressable::URI.parse(query_string)
parsed_uri.query_values["ACK"]
#=> "Success"

parsed_uri.query_values = parsed_uri.query_values.merge("ACK" => "Changed")
parsed_uri.to_s
#=> "?ACK=Changed&asdasda=asdaskdmasd&asmda=asdakmsd"
# Note how the order has changed and the duplicate key has been removed due to
# Addressable's built-in normalisation.