text: from re import compile
  from string import Template
  
  
  class OTemplate(Template):
      delimiter = "_0_"
      idpattern = r"[a-z][_a-z0-9]*"
  
  
  def is_email(s):
      email = compile(r"[^@]+@[^@]+\.[^@]+")
      return email.match(s) is not None
  
  
  def is_domain(s):
      domain = compile(r"^([a-z0-9-]+.)?([a-z0-9-]+).pl$")
      return domain.match(s) is not None
  