As a veteran software engineer, I have architected and developed a number of software management systems using Java/JavaScript. I have been the interviewer and interviewee for many frontend developer positions. I published [ACE Your Java Interview](https://www.amazon.com/ACE-Your-Java-Interview-Jennifer/dp/1484104935/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=1566344263&sr=1-9) a few years ago, which is still a best-seller today.

My fellow developers ask me when I am going to publish an interview reference book for JavaScript. I have been working on it for a while. The content keeps changing along with the evolving ECMAScript standards, as well as emerging frameworks and libraries. It becomes a never-ending project.

For years, I have been nourished by a lot of open source materials. I have read many articles, and some of them become my favorites. Why don’t I link them in a centralized location to make a JavaScript Web for easy access? It is no longer a conventional book. It is composed by many people’s work, and it is a resource for frontend job interview and daily development work.

This provides a number of advantages:

* It allows constantly adding and updating content.

* It speeds up the writing process.

* It gets on-going feedback.

Happy reading and practicing!

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.