Dear user, welcome to Webmail 2.0, the email client for the discerning, regex-loving individual.
Here's a list of our most impressive atomic regex patterns:
Or, if you're feeling adventurous, try:
Disclaimer: Webmail 2.0 is not responsible for any emotional trauma caused by our regex patterns.
Also, please do not attempt to use our regex patterns for nefarious purposes. We have lawyers.