Function is_valid_email 

pub fn is_valid_email(s: &str) -> bool

Check if string looks like an email (basic validation)

This is a simple check, not RFC-compliant.

Example

assert!(is_valid_email("user@example.com"));
assert!(is_valid_email("name.surname@domain.co.uk"));
assert!(!is_valid_email("invalid"));
assert!(!is_valid_email("@example.com"));
assert!(!is_valid_email("user@"));