Added feedback for when only length is wrong in K1

I'm creating this pull request to get feedback.  It's not ready to commit.
First time I've seen a config property on a utility method (looks like [it's a thing](http://www.bennadel.com/blog/1522-storing-property-data-in-javascript-function-objects.htm))! Since it's paired with the `'">'` it could make sense to also pull that out into a property or just put the regex as a var in the function