Add Regex tutorial.

Author: eamanu

README.md

@@ -56,6 +56,7 @@ But knowing the stuff will help you become better! :muscle:*
 
 ### RegExp
 - [RegexHQ](https://github.com/regexhq)
+- [Learn regex the easy way](https://github.com/zeeshanu/learn-regex.git)
 
 ### Security
 - :book: [Security Programming](https://www.dwheeler.com/secure-programs/)