Add Regex

https://github.com/slevithan/awesome-regex

> An opinionated list of regular expression tools, tutorials, libraries, etc.

Covers all major regex flavors, and currently includes especially deep coverage of regular expressions in JavaScript. Not a list of merely well-known tools and resources, but rather the very best.

### By submitting this pull request I confirm I've read and complied with the below requirements 🖖

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	- [Add Technical Writing Learning sindresorhus#3022 (comment)](sindresorhus#3022 (comment))
	- [Add Microsoft Azure Architecture sindresorhus#3029 (comment)](sindresorhus#3029 (comment))
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readme.md

@@ -918,6 +918,7 @@
 - [Astrophotography](https://github.com/lunohodov/awesome-astrophotography#readme) - Photography of astronomical objects, celestial events, or areas of the night sky.
 - [HPC](https://github.com/dstdev/awesome-hpc#readme) - High Performance Computing.
 - [Geocaching](https://github.com/FoxFil/awesome-geocaching#readme) - Outdoor treasure-hunting activity that uses GPS-enabled devices.
+- [Regex](https://github.com/slevithan/awesome-regex#readme) - Specialized language for matching patterns in text.
 
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