Create JavaScript-web.md

JenniferFuBook · web-flow · commit fa9b974f3227 · 2019-08-28T18:07:05.000-07:00
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+# 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.
