This is a tutorial on building a URL search with a regular expression. This will cover part or most of the syntax.
I will be describing the syntax of a regular expression provided by the Challenge 17 documentation.
The following code snippet is from the readme.md file which describes searching for a matching email using a regular expression:
/^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/