Extract all emails from files inside a directory. Writen in Crystal lang

emails_extractor.cr

dir = "msgs/"
emails = Set(String).new
errors_count = 0
msgs = Dir.entries(dir)
msgs.each { |msg|
  next if msg == "." || msg == ".."
  begin
    texto = File.read(dir + msg)
    matches = texto.scan(/[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,64}/)
    p matches[0][0]
    emails.add(matches[0][0])
  rescue
    errors_count = errors_count + 1
  end
}
p emails
p "Total de mensagens #{msgs.size - 2}"
p "Errors total: #{errors_count}"
output = ""
emails.each {|email| output=output + email + "\n"}
File.write("TODOS_EMAILS.txt",output)