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RegExr
RegExr is a HTML/JS based tool for creating, testing, and learning about Regular Expressions.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
There's this: https://regexr.com/
You could set up a test script in GUT. It has a panel in the editor that makes it easy to run. While it's aimed at tests, you can have it print output when it runs and ignore the asserts. It also has a CLI that might be up your alley!
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.