email-validation

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]+$|\b polygenelubricants To match pattern or an empty string, use ^$|pattern Explanation ^ and $ are the beginning and end of the

Possible Duplicate: Best practices for validating email address in Objective-C on iOS 2.0? I am developing an iPhone application where I need the user to give his email address at login. What is the best way to check if an email address is a valid email address? Good cocoa function: -(BOOL) NSStringIsValidEmail:(NSString *)checkString { BOOL stricterFilter = NO; // Discussion http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/ NSString *stricterFilterString = @"^[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}$"; NSString *laxString = @"^.+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2}[A

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 side validation but at this point I'm not worried about which email address regex is right. Is there a

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. Andy /** * 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.CASE_INSENSITIVE); Matcher matcher = pattern.matcher(email); return matcher.matches(); } Pass your edit

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 RegEx pattern instead. I'm just wondering how someone could get away with using the email type instead.