Restrictions in input as spam protection?

Question

JavaScript

Hello.

There is a feedback form with 4 fields (Name, Phone, E-mail, Message).

If only Russian letters are allowed in the Name field, only numbers are allowed in the Phone field, and only Latin letters + numbers + dot-dash-dot are allowed in the E-mail field - will these spam manipulations help? Or is all this safely managed by spam bots and you can’t do without captcha?

Thank you.

Answer 1

You can try to make a fake field and check it if it is filled then the form is not sent

Answer 2

Either captcha or pre-authorization and only through trusted social networks and that is not a panacea, but a way to significantly reduce the amount of spam

Answer 3

Spam bots attack not the form, but the script handler. Accordingly, everything that you do on the client side, in html or js, will not save you. Validation on the server side + blacklists of ip addresses is needed.