gistfile1.txt

require 'csv'

path = 'db/registered_students_fall_2010.csv'
row_index   = 0

created_after_9_1 = YAML::load_file('db/created_after_9_1.yml')

p created_after_9_1.size

results = []
CSV::Reader.parse(File.open(path)) do |row|
  next if row[2] == 'email'

  if !created_after_9_1.select {|r| r['email'] == row[2]}.empty?
    results << row
  end
end

results