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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.
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RE2
RE2 is a fast, safe, thread-friendly alternative to backtracking regular expression engines like those used in PCRE, Perl, and Python. It is a C++ library.
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ComposableRegex
Build out composable regular expressions from simple sub blocks in a BNF type syntax. Check http://composableregex.apphb.com/ for a demo
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swift-evolution
This maintains proposals for changes and user-visible enhancements to the Swift Programming Language.
I've always relied on regexr.com to help me create patterns. It's enough to get by without me having to learn much in depth.
Ummm... Google has a Regex for email validation, right here.
That sort of thing is why Google's RE2 regular expression library exists: