与えられたカッコ（なんでも．開きと閉じとの定義を引数にくれればいい）内を抜き出します． ruby extract_between_parentheses.rb "「」" YOUR_FILE_NAME

extract_between_parentheses.rb

# coding: utf-8
open_paren = Regexp.quote(ARGV[0][0])
close_paren = Regexp.quote(ARGV[0][1])

open(ARGV[1]).read.lines
  .select {|x| x.include?(ARGV[0][0]) && x.include?(ARGV[0][1])}
  .map{|x|
  x
    .gsub(/^(.*?)#{open_paren}/, "#{open_paren}")
    .gsub(/#{close_paren}[^#{open_paren}]*$/, "#{close_paren}")
    .gsub(/#{close_paren}.*?#{open_paren}/,"#{close_paren}#{open_paren}")
}.join('').split(ARGV[0][1]).each{|x| puts "#{x + ARGV[0][1]}"}