New Feature: Test area

[noxone]

Is your feature request related to a problem? Please describe.
I'm always frustrated when I have the output regex and want to test it against even more text samples.

Describe the solution you'd like
Add a new (optional) step to very the generated regex against several lines of sample text.

Describe alternatives you've considered
Copy the regex into a page like regex101. But then I would need to change the website.

[gaurav-nelson]

+1 for this new feature