languages: read regex article series.

erikgrinaker · Feb 6, 2021 · d96162f · d96162f
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diff --git a/languages-and-compilers.md b/languages-and-compilers.md
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 ### Regular Expressions
 
-- [ ] 🛠 [Let's Build a Regex Engine](https://kean.blog/post/lets-build-regex) (A Grebenyuk 2019)
-- [ ] 📄 [Regular Expression Matching Can Be Simple And Fast](https://swtch.com/~rsc/regexp/regexp1.html) (R Cox 2007)
+- [x] 🛠 [Let's Build a Regex Engine](https://kean.blog/post/lets-build-regex) (A Grebenyuk 2019)
+- [ ] 📄 [Regular Expression Matching Can Be Simple And Fast](https://swtch.com/~rsc/regexp/regexp1.html) (R Cox 2007)