sounds easy enough to test, I'd be interested in seeing any results

It should be faster than regex solution

Nah, it's a perfectly normal "best solution".

The every method executes the provided callback function once for each element present in the array until it finds one where callback returns a falsy value. If such an element is found, the every method immediately returns false.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every#Description

every() or some() also don't have to go through all the elements, they will stop at the first element which do not fit ;-)