It’s probably a waste of time for an individual developer to write a one-off complicated regex for a contact form. A team of contributors to a standard library

It’s probably a waste of time for an individual developer to write a one-off complicated regex for a contact form. A team of contributors to a standard library should be optimizing regex a bit more since doing so will save so many developers time vs using even a very simple one-off regex, when testing is accounted. The optimizations here are reasonable and internationally compatible.