How to set unknown text in the bot command for Telegram?

Question

PHP

Hello, I'm making a bot for TG. I use switch($text) to process the user's command, where $text is the text of the message. There is a /invoice command (any numbers). Serves to replenish the balance. The essence of the question is how to correctly set these numbers for the handler. I looked in the direction of regular expressions, it is not entirely clear how to write them correctly. Tell me please.

Answer 1

It is necessary to separate the concept of command and arguments, otherwise you will not come to anything normal.