text: import re
  from typing import Generator, Optional
  
  EMAIL_SEARCH_REGEX = r"([a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+)"
  
  
  def search(text: str) -> Generator:
      results = re.finditer(EMAIL_SEARCH_REGEX, text)
  
      for result in results:
          yield result.group(1)
  
  
  def search_one(text: str) -> Optional[str]:
      for result in search(text):
          return result
  
      return None
  