Help functions for urls and mail addresses

Do improve phishing detection we might need the following help functions:

1. Split a mail address in local identity, subdomains, domain
2. Split a mail address in subdomains, domains, parameters and other parts
3. Find mail addresses and urls in a text

Steps:

• Find a good spot for this functions
• Implement functions
• Add test cases

(optional) ideas:

• add detection for <script>