input: Write a function to extract all email addresses from a given string using a regular expression. Return the list of email addresses found.
  
  import re
  
  def find_emails(text):
      regex = r"([a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+)"
      emails = re.findall(regex, text)
      return emails
  
  assert find_emails("This is an example with two emails: john@example.com, and jane@example.com")==['john@example.com', 'jane@example.com']
  assert find_emails("No emails here.")==[]
  assert find_emails("Contact me at: support@company.com")==['support@company.com']
  assert find_emails("")==[]
  assert find_emails("Multiple emails: info@domain.com, sales@domain.com, support@domain.com")==['info@domain.com', 'sales@domain.com', 'support@domain.com']
output: def find_emails(text):
      regex = r"([a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+)"
      emails = re.findall(regex, text)
      return emails