Update README.md

JenniferFuBook · web-flow · commit 9eb166690c93 · 2019-08-28T21:47:48.000-07:00
diff --git a/README.md b/README.md
@@ -11,5 +11,14 @@ This provides a number of advantages:
 *	It speeds up the writing process.
 *	It gets on-going feedback. 
 
+Happy reading and practicing!
 
-[Happy reading and practicing!](https://github.com/JenniferFuBook/JavaScriptWeb/blob/master/JavaScript-web.md)
+
+## Regular Expressions
+Regular expressions are patterns used to match character combinations in strings. It is extremely effective for searching, manipulating, and validating strings.
+
+[A Practical Guide to Regular Expressions](https://blog.bitsrc.io/a-beginners-guide-to-regular-expressions-regex-in-javascript-9c58feb27eb4) is comprehensive with handson examples.
+
+[Lookbehind and Lookahead](https://itnext.io/whats-new-in-javascript-google-i-o-2019-summary-d16bd2308412) are the latest additions to the Regular expression family.
+ 
+[Online Regular Expression Tester and Debugger](https://regex101.com/) is a convenient tool to test out specific regular expressions.
