What is the best way to make a backend and admin panel for an application?

Question

Regular Expressions

There is an application on Flutter, which, in essence, should simply accept data and display it. The data itself will be entered through the web interface. Tell me, please, what to read on the topic and what technologies are better to use in general? There is a fairly fashionable among firebase mobiles, will it fit? Or do you need to separately write a back and fasten the database?

Answer 1

You can try this expression: (?:[^%]|^)(?:%%)*(%)(?:[^%]|$)
https://regex101.com/r/aD0mW1/1
Looks like scary, because I removed the capturing of unnecessary parts (If it's not scary, can you remove ?: from everywhere) and allowed percentages to appear at the beginning / end of the line

Answer 2

do not toil with garbage, but replace a couple of %% with ~~~$~~~
throw out single ones
and replace them back

Answer 3

It is better to write on what you can or can quickly learn - at the current level of understanding, doing at least something will be a big step forward.
And during the development process, you will encounter problems, you will solve them (not always successfully) and better understand the requirements for both the server side and the admin panel. Based on this, look for other tools and ways to solve your problems. The only way.
No one who sees the application, its tasks, the load on the server (planned), the number of users and the prospects (hopes) for the development of the application will not be able to give an unambiguous and correct answer like "Use this, this and this."
Good luck!