Regular Expressions, or more commonly referred to as Regex, is a way to use characters to match a pattern in a string. These can be useful for user input validation or implementing a find and replace feature in your app.
The use case I will be showing is validating a user's email.
/^([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$/
I know this might look like egyptian writing, but don't worry, I will go through each character and how it works and how they all work together to validate an email.