メールアドレスã®ãƒãƒªãƒ‡ãƒ¼ã‚·ãƒ§ãƒ³ by Ruby -blog-Motivation Driven Developmentjavascriptã«ã‚ˆã‚‹ç°¡æ˜“regexã§ã¯å¯¾å¿œã§ããªã„ケースãŒã§ã¦ã—ã¾ã£ãŸã®ã§ã€ã„ã‚ã„ã‚å‚考ã«ã—ã¤ã¤ruby版を作ã£ãŸã€‚ require 'resolv' require 'pp' class MailAddressValidator def self.validate(address) return validate_by_regex(address) && validate_by_MX(address) end def self.validate_by_regex(address) addr_spec = %r{^(?:(?:(?:(?:[a-zA-Z0-9_!#\$\%&'*+/=?\^`{}~|\-]+)(?:\.(?:[a-zA-Z0-9_!#\$\%&'*+/=?\^`{}~|\-]+))*)|(?:"(?:\\[^\r\n]|[^\\"])*")))\@(?:(?:(?:(
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