RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
33Mail - Simple free disposable email address service, unlimited free disposable email addresses.
Expresso - The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.
TempMail - Temp Mail is the provider of fake and temporary email ID.
rubular - A ruby based regular expression editor
SimpleLogin - Receive and send emails anonymously. Create a unique email address for each website to avoid cross-site tracking and protect your inbox from spam, phishing and data breaches.