Test, validate and match regular expressions
This regex matches simple email addresses with word characters on both sides of the @ symbol and a domain ending in .com, .ru, or .net. It is useful for basic email format validation or extracting email-like tokens from text, but it does not handle all valid email forms (e.g., plus signs, hyphens, subdomains). Use it for quick filtering in scripts or forms where only these top-level domains are expected.