email-validation

问题 I am working on a web app that requires me to check if the users email are valid and exists. (I do the regex check) The question is what is best practice of verifying that an email exists? Here are some options that I have though about: send an email to the user and make them confirm the email address do a VRFY SMTP - is this still used? should i bother looking into it? any other good idea? 回答1: sending a verification email to the user verifies that the email is valid and that the user is the

问题 This question already has answers here : How to validate an email address using a regular expression? (73 answers) Closed 6 years ago . For PHP what is the best email validation using preg , NOT ereg because it's deprecated/removed . I don't need to check if the website exists (it's not like maximum security). I've found many ways with ereg but they (obviously) aren't good practice. 回答1: I suggest you use the FILTER_VALIDATE_EMAIL filter: if (filter_var($email, FILTER_VALIDATE_EMAIL)) { /

问题 Is there any rule for having a specified amount of @ symbol in any email id. Just come to my mind if we're to check if an email id is valid or not using PHP. 回答1: If enquoted multiple @ are allowed. I have to ask why do you need this information. Please please please do not try to write a regex / function or whatever to validate emailaddresses. You have to worry about 3 rfc's (and perhaps 4 if you want to take into account unicode). And you will fail and it will drive you mad. See my previous

问题 I would like to know of the possible ways to block disposable email addresses from registering in my website. For simplicity, let's take the example where the registration form of the website is done with HTML and PHP. Any ideas, solutions or suggestions would be greatly appreciated. 回答1: This is tough, because neither whitelisting nor blacklisting are an option. By whitelisting certain domains, you disallow people with email domains that are unknown to you (but might be perfectly valid),

问题 I have the following Regular Expression which matches an email address format: ^[\w\.\-]+@([\w\-]+\.)+[a-zA-Z]+$ This is used for validation with a form using JavaScript. However, this is an optional field. Therefore how can I change this regex to match an email address format, or an empty string? From my limited regex knowledge, I think \b matches an empty string, and | means "Or", so I tried to do the following, but it didn't work: ^[\w\.\-]+@([\w\-]+\.)+[a-zA-Z]+$|\b 回答1: To match pattern

问题 I find that jQuery validation plugin regex to be insufficient for my requirement. It accepts any email address xxx@hotmail.x as a valid email address whereas I want to be able to supply this regex /^([a-zA-Z0-9_.-+])+\@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/ so that it would validate complete .com part of the address. I'm more concerned about being able to supply my own regex than getting a fool proof regex(as there is no fool proof regex for email validation) Just FYI: I'm also doing server

问题 I find that jQuery validation plugin regex to be insufficient for my requirement. It accepts any email address xxx@hotmail.x as a valid email address whereas I want to be able to supply this regex /^([a-zA-Z0-9_.-+])+\@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/ so that it would validate complete .com part of the address. I'm more concerned about being able to supply my own regex than getting a fool proof regex(as there is no fool proof regex for email validation) Just FYI: I'm also doing server

问题 how to check the text of edittext is email address or not without using javascript and regular expression? Here I used inputtype="textEmailAddress" this is working but no error message is display. 回答1: /** * method is used for checking valid email id format. * * @param email * @return boolean true for valid false for invalid */ public static boolean isEmailValid(String email) { String expression = "^[\\w\\.-]+@([\\w\\-]+\\.)+[A-Z]{2,4}$"; Pattern pattern = Pattern.compile(expression, Pattern

问题 how to check the text of edittext is email address or not without using javascript and regular expression? Here I used inputtype="textEmailAddress" this is working but no error message is display. 回答1: /** * method is used for checking valid email id format. * * @param email * @return boolean true for valid false for invalid */ public static boolean isEmailValid(String email) { String expression = "^[\\w\\.-]+@([\\w\\-]+\\.)+[A-Z]{2,4}$"; Pattern pattern = Pattern.compile(expression, Pattern

问题 I'm writing a very simple mock-up to demonstrate some HTML5 form-validation. However, I noticed the email validation doesn't check for a dot in the address, nor does it check for characters following said dot. In other words, "john@doe" is considered valid, when it's clearly not a valid email address; "doe" isn't a domain. This is how I'm coding my email field: <input type="email" required /> Is that not enough? Check this fiddle to see what I mean. Note: I know how to accomplish this via a