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RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
HTTPDump - A simple, beautiful Webhook debugging tool.
rubular - A ruby based regular expression editor
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
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.
httpbin(1) - HTTP request and response service