Check if a JavaScript string is a URL

Question

Is there a way in JavaScript to check if a string is a URL?

RegExes are excluded because the URL is most likely written like stackoverflow; that is to s

Answer 1

In my case my only requirement is that the user input won't be interpreted as a relative link when placed in the href of an a tag and the answers here were either a bit OTT for that or allowed URLs not meeting my requirements, so this is what I'm going with:

^https?://.+$

The same thing could be achieved pretty easily without regex.