Let's take a closer look at the two expressions used in the previous code example. Comparing them with each other, you can see the change we made in yellow:
Before we get to what that change means, let's break up the expression and view the individual components. Our regex is basically saying that we must match all string dates that start with 19 or 20 and have the following separators:
- Dash (-)
- Decimal (.)
- Forward slash (/)
To understand the expression better, we need to understand the following format of the expression <Valid Years><Valid Separators><Valid Months><Valid Separators><Valid Days>.
We also need to be able to ...
