I'm not being user hostile. I'm being cognizant that the skill levels of users is extremely wide, and to best serve everyone from a UX standpoint, it's best to limit the characters accepted in the input. It protects the user, helps them avoid mistakes.

> Users are too stupid.

That is the definition of user hostile. Why lie? You make yourself and your organization look bad.

Not everyone who disagrees with you is lying. Accusing people is a bad look here on HN. "Assume good faith" is the standard.

You can say "You're wrong". "You're lying", though, is almost never appropriate, and is, in itself, quite hostile.

Again “users are too stupid”. That’s remarkably hostile to users and doesn’t belong.

Please read my other comments. I'm not using "stupid" in the derogatory sense. I'm using it as a recognition of the skill/knowledge gap between technical and non-technical users.

Fine. But "you're lying" is also hostile, and also doesn't belong.

(I see that you edited that bit out of your post, so thanks for listening...)

From reading your comments, you're extremely user hostile and I hope to not come across anything you work on because they are the very definition of antipatterns

It's a decimal number field. There's no reason to have any other characters than [0-9\.-]* You're overreacting. You're attacking me for no reason.

Except if one copied it and it has a space in the beginning and your amazing script won't let one paste it.