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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.
Sure you can try https://regexr.com. For Reddit Regex, make sure it's on PCRE (top right), and for flags check case insensitive. Then you can test the regex in the top input box, against text in the bottom input box.
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.