What is a valid email address format

A valid email address format is a string of characters that conforms to the following rules:

1. Local part: The local part is the part of the email address that comes before the @ symbol. It can contain:
   • Alphanumeric characters (letters and numbers)
   • Dot (.) characters
   • Hyphen (-) characters
   • Underscore (_) characters
   • The local part must be at least 1 character long, but there is no maximum length.
2. Domain: The domain is the part of the email address that comes after the @ symbol. It can contain:
   • Alphanumeric characters (letters and numbers)
   • Dot (.) characters
   • The domain must be at least 2 characters long, but there is no maximum length.
3. Top-level domain (TLD): The TLD is the last part of the domain. It is usually a generic top-level domain (gTLD) such as .com, .org, .net, or a country-code top-level domain (ccTLD) such as .us, .uk, etc.
4. Email address syntax: The email address syntax is as follows:
   • [email protected]

Examples of valid email addresses:

• [email protected]
• [email protected]
• [email protected]

Examples of invalid email addresses:

• @example.com (missing local part)
• john.doe@ (missing domain)
• john.doe@example (missing TLD)
• [email protected] (multiple consecutive dots)

Note that while the above rules are generally accepted, some email providers may have additional or stricter requirements for email addresses.