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Observable - Interactive code examples/posts
rubular - A ruby based regular expression editor
Calculist - The open-source, web-based thinking tool that facilitates effective thinking for solving problems.
RegEx Generator - RegEx Generator is a simple-to-use application that comes with the brilliance of intuitive regex and is also helping you out to test the regex.
Jupyter - Project Jupyter exists to develop open-source software, open-standards, and services for interactive computing across dozens of programming languages. Ready to get started? Try it in your browser Install the Notebook.
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.