email-validation

What RFC would I refer to in order to find out if a leading underscore in the local part of an email address is acceptable? Example: _johndoe@hotmail.com Of course, this question can also apply to any leading special character. I found this line in Wikipedia, but couldn't find any reference within the RFC itself. Did I miss something here? Local part The local-part of the email address may use any of these ASCII characters RFC 5322 Section 3.2.3: Quoting RFC5322. Section 3.4.1 says: An addr-spec is a specific Internet identifier that contains a locally interpreted string followed by the at

//if HTML5 input email input is not supported if(type == 'email'){ if(!Modernizr.inputtypes.email){ var emailRegEx = /^([a-zA-Z0-9_\.\-])+\@([a-zA-Z0-9\-])+\.+([a-zA-Z0-9]{2,4})+$/; if( !emailRegEx.test(value) ){ this.focus(); formok = false; errors.push(errorMessages.email + nameUC); return false; } } } This is my javascript regex for checking if e-mail format is correct. But When I try it myself it shows no error for any ..@.. It does not check .com or whatever in the end. What am I doing wrong? You need to use a regex that actually fits for an email address. Your current one is completely

I'm trying to assign a user to their companys group based on their email domain. I'm using devise + confirmation, so I avoided using regex (dont need to validate that its a valid email...), and am trying to do this in a simple way. So essentially, it would force the users company_id (which matches up with that table) to be assigned in sign up, and then not allow them to sign up if their company doesnt exist. So this will work for both test@company.com and test@recruiting.company.com In User model before_create :company_placement ... def company_placement user_domain = (:email).split('@').last

I'd like to use the new <input type="email" /> element. I'd like to have Java code that implements the same validation on the server that happens in the browser. The HTML5 spec defines email addresses in ABNF as: 1*( atext / "." ) "@" ldh-str *( "." ldh-str ) where : <ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str> <let-dig-hyp> ::= <let-dig> | "-" <let-dig> ::= <letter> | <digit> <letter> ::= any one of the 52 alphabetic characters A through Z in upper case and a through z in lower case <digit> ::= any one of the ten digits 0 through 9 and : atext = ALPHA / DIGIT / ; Printable US-ASCII "

Since there are so many valid characters for email addresses, are there any valid email addresses that can in themselves be XSS attacks or SQL injections? I couldn't find any information on this on the web. The local-part of the e-mail address may use any of these ASCII characters: Uppercase and lowercase English letters (a–z, A–Z) Digits 0 to 9 Characters ! # $ % & ' * + - / = ? ^ _ ` { | } ~ Character . (dot, period, full stop) provided that it is not the last character, and provided also that it does not appear two or more times consecutively (e.g. John..Doe@example.com). http://en