simple_match2.rb

pattern = Regexp.new("(.{10})("+ARGV[0]+")(.{10})")
filename = ARGV[1]

count = 0
File.open(filename) do |file|
  file.each_line do |line|
    line.scan(pattern) do |s|
      puts "#{s[0]}<<#{s[1]}>>#{s[2]}"
      count += 1
    end
  end
end
puts "count: #{count}"