Regex Tester & Validator

Matches one or more comma-separated email addresses, where each local part starts with a lowercase letter followed by letters, digits, underscores, or dots, and the domain consists of one or more hyphenated labels ending in a 2-6 letter TLD. An optional comma with optional whitespace separates each address, making it useful for validating recipient lists (e.g., To/CC fields) in forms. Note it only accepts lowercase characters and doesn't cover all RFC 5322-valid address forms.