Override browser spellchecking with your own?

I'm writing a form with javascript validation, I'd like to override the browser's built in spell checking.

For example, let's say I'm checking serial numbers and they all pass a regex text. I'd like to highlight the ones who don't in the browser much likes the browser highlights words with invalid spelling.

All I could come up with is disabling the browser's built in spell checking

So to sum it up

Is there a simple way to override a browser's built in spell check (sort of how like you override the comparator when you sort an array in javascript)

If there is not, is there a simple way to emulate such behavior?

Thanks a lot