added regexp books for Python, JavaScript, Ruby (#57)

4 years ago · 04c8255bd7
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 ## Regular Expressions

 - [📕 Regular expressions cookbook (2009)](http://www.goodreads.com/book/show/6125777-regular-expressions-cookbook)
+- [📖 Python re(gex)? (2020)](https://learnbyexample.github.io/py_regular_expressions/)
+- [📖 JavaScript RegExp (2020)](https://learnbyexample.github.io/learn_js_regexp/)
+- [📖 Ruby Regexp (2020)](https://learnbyexample.github.io/Ruby_Regexp/)

 ## Reinforcement learning