What does the expression /some/ mean in JS?

Question

JavaScript

I saw this in code examples for Node using the Telegram Bot API. The search is complicated by special characters, search engines do not understand, and I don’t know the specific name.
Example:

bot.onText(/echo (.+)/, (msg, match) => {
  bot.sendMessage(msg.chat.id, match[1]);
});

Answer 1

https://developer.mozilla.org/en/docs/Web/JavaScri...
https://regex101.com/r/n9FwIg/2/
/echo (.+)/
"echo" + whatever