Parsing the text file in ruby - ruby-on-rails

Question

My text file looks like this
VOTE 1168041805 Campaign:ssss_uk_01B Validity:during Choice:Antony CONN:MIG01TU MSISDN:00777778359999 GUID:E6109CA1-7756-45DC-8EE7-677CA7C3D7F3 Shortcode:63334
VOTE 1168041837 Campaign:ssss_uk_01B Validity:during Choice:Leon CONN:MIG00VU MSISDN:00777770939999 GUID:88B52A7B-A182-405C-9AE6-36FCF2E47294 Shortcode:63334
I want to get value of vote campaign validity choice for which I am doing this:
File.foreach('lib/data/file.txt') do |line|
line = line.tidy_bytes
begin
aline = line.match(/^VOTE\s(\d+)\sCampaign:([^ ]+)\sValidity:([^ ]+)\sChoice:([^ ]+)/)
unless aline.nil?
## do something
end
rescue Exception => e
raise " error: " + e.inspect
p line.inspect
next
end
end
Is there any better way for doing this for
aline = line.match(/^VOTE\s(\d+)\sCampaign:([^ ]+)\sValidity:([^ ]+)\sChoice:([^ ]+)/)
and getting aline[1] aline[2] aline[3] and aline[4]

Answer 1

You can use named captures to get a hash of results instead:
# use a freezed contant instead of making a new Regexp object for each line
REGEXP = /^VOTE\s(?<id>\d+)\sCampaign:(?<campaign>[^ ]+)\sValidity:(?<validity>[^ ]+)\sChoice:(?<choice>[^ ]+)/.freeze
File.foreach('lib/data/file.txt') do |line|
begin
matches = line.tidy_bytes.match(REGEXP)
hash = matches.names.zip(matches.captures).to_h
end
rescue Exception => e
raise " error: " + e.inspect
p line.inspect
next
end
end
If the desired result is an array you might want to use .map:
# use a freezed contant instead of making a new Regexp object for each line
REGEXP = /^VOTE\s(?<id>\d+)\sCampaign:(?<campaign>[^ ]+)\sValidity:(?<validity>[^ ]+)\sChoice:(?<choice>[^ ]+)/.freeze
results = File.foreach('lib/data/file.txt').map do |line|
matches = line.tidy_bytes.match(REGEXP)
matches.names.zip(matches.captures).to_h
end