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Self-validating Ruby objects
ActiveModel email validation. Checks MX records, sub address, regex, whitelisted and blacklisted check
Validate image height and width for Paperclip
台灣身分證字號 驗證&產生 的 Gem
Rails validators for polish numbers: PESEL, NIP, REGON, IBAN (PL)
Rails validators for: date, date_time, ip address, mac address