2020-08-07 22:54:32 -04:00 · 2020-08-07 22:54:32 -04:00 · c1f0c767a8
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-.. _references:
+# Reference websites, documents, and books

-A Reference of References
-=========================
+*A Reference of References*

-Regular Expressions
-------------------
+## Regular Expressions
+
+  * [Regexr.com](https://regexr.com/ )
+
+## Firefox
+
+  * [Firefox and the "about" protocol - Mozilla](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/The_about_protocol )

-https://regexr.com/