validation of email address in compliance with the RFCs is not something that can be achieved with a one-liner regular expression. The following JavaScript- and Perl-compatible regular expression is an implementation of the above definition. This requirement is a willful violation of RFC 5322, which defines a syntax for e-mail addresses that is simultaneously too strict (before the character), too vague (after the character), and too lax (allowing comments, whitespace characters, and quoted strings in manners unfamiliar to most users) to be of practical use here. Label = let-dig let-dig ] limited to a length of 63 characters by RFC 1034 section 3.5 Ī valid e-mail address is a string that matches the email production of the following ABNF, the character set for which is Unicode. If your browser supports HTML5 then you can use the following code. Always test them on your own data and with your own applications. Don't blindly copy regular expressions from online libraries or discussion forums. This regex filters dummy email addresses like You will need to update it as new top-level domains are even when following official standards, there are still trade-offs to be made. It will still match 99.99% of all email addresses in actual use further change you could make is to allow any two-letter country code top level domain, and only specific generic top level domains. You can ( but you shouldn't - read on) implement it with this regular We get a more practical implementation of RFC 2822 if we omit the syntax using double quotes and square brackets. It describes the syntax that valid email addresses must adhere to. The official standard is known as RFC 2822. Just for completeness, here you have another RFC 2822 compliant regex
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