データーから特定(回答）のデーターを抜き出し別のデーターを出力する方法を探しています。

Question

### データーから特定(回答）のデーターを抜き出し別のデーターを出力する方法を探しています。

The time will soon come {{c1::(文字)}} we can enjoy space travel.
1. when 2. where
3. what 4. whic
1.私たちが宇宙旅行を楽しむことができる時が程なくやってくるだろう。

こういうデータから

① The time will soon come {{c1::(1.when)}} we can enjoy space travel.
1. when 2. where
3. what 4. whic
 
② The time will soon come we can enjoy space 

こういう二つのでデータを出力したいのですがうまくいきません。

require 'csv'

def clean_text(text)
    text.gsub(/\{\{c1::([0-9].\s?(?=[a-z])/,"").gsub(/)\}\}/,"")
end

output = []

CSV.foreach("karaage.csv", liberal_parsing: true, encoding:'iso-8859-1:utf-8') do |row|
    card = []

    answer = row[1][0]
    full_prompt = row[0]
    question = full_prompt[/.*?(?=\s1)/]

    # skip if already solved
    if /c1::([0-9]/.match?(question)
        card << full_prompt
        card << clean_text(question)
    else
        puts "full prompt: #{full_prompt}\n"
        puts "answer: #{answer}\n"
        puts full_prompt[/#{answer}.*#{Integer(answer)+1}/]
        puts "\n"
        answer_text = full_prompt[/#{answer}.*#{Integer(answer)+1}/][0...-2]
        subbed = full_prompt.gsub(/(?<=().*?(?=))/, answer_text)
        subbed_question = question.gsub(/(?<=().*?(?=))/, answer_text)
        card << subbed
        card << clean_text(subbed_question)

    end
    
    # puts full_prompt.gsub(/\{\{.*\}}/, answer_text)
    puts "\n"
    output << card
end

File.write("output.csv", output.map(&:to_csv).join)

I was tired after the test last Friday, because I {{c1::(文字)}} all,
 day long every day for a week., 
1.had been working  2. have been working, 3. have worked  4. was working	
1.私は先週の金曜日にテストが終わると疲れてしまった。というのもそれまで1週間毎日一日中勉強していたからだ。

試しに上のデーターをかけると下のようになってしまいます。

①　I was tired after the test last Friday, because I {{c1::(1::(文字)}} all, 
day long every day for a week., 1.had been working )}} all, day long every day for a week., 
1.had been working  2. have been working, 3. have worked  4. was working
	
② I was tired after the test last Friday, because I {{c1::(1::(文字 all, 
day long every day for a week., 1.had been working  all, day long every day for a week.,