How to prevent Uncaught DOMException when checking selector in document.querySelector

Question

in JavaScript I have code like:

var text = '[0-9]';
if (document.querySelector(text) !== null) {
alert('fail');
}

When I run it, there is an error:

Uncaught DOMException: Failed to execute 'querySelector' on 'Document': '[0-9]' is not a valid selector.

Please how to check if querySelector is valid or invalid without this error?

I want to have ability to write anything to variable "text" and I want the code to alert "failed" when it is not valid selector. Without that error, no matter what variable "text" contains.