I want you to act as a web developer and please write some code for me to create a form validation feature for a website.

I want you to act as a web developer and please write some code for me to create a form validation feature for a website.
Format validation:
Email address: Must conform to the standard email format (including @ and a domain name).
Phone number: Perform regular expression matching based on the target region (e.g., Chinese phone number).
Password: Strength check (e.g., at least 8 characters, including both uppercase and lowercase letters, as well as numbers).
Confirm password: Must be exactly the same as the “Password” field.