You will learn about regular expressions in 55 minutes. To learn how to use regular expressions, in as long as it might take you, it might be better to:
And remember, writing regular expressions can be very difficult, reasoning about your regular expressions can be even more so, defining your problem can be the most difficult of all. Think before you regex.
Read the wikipedia page which has a great description of what regular expressions are and why you would use them: https://en.wikipedia.org/wiki/Regular_expression
Read the JS docs: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guid...
Test your regexes: http://regexpal.com/
Visualize your regexes: http://www.regexper.com/
Try some challenges: http://callumacrae.github.io/regex-tuesday/
And remember, writing regular expressions can be very difficult, reasoning about your regular expressions can be even more so, defining your problem can be the most difficult of all. Think before you regex.