Email validating form

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I think Regex is only good for a rudimentary validation.It seems that the checking validation of email addresses is actually two separate problems: 1- Validation of email format: Making sure if the email complies with the format and pattern of emails in RFC 5322 and if the TLD actually exists. For example, although the address Here is a very good discussion about using regular expressions to validate email addresses; "Comparing E-mail Address Validating Regular Expressions" Here is the current top expression, that is Java Script compatible, for reference purposes: /^[-a-z0-9~! ] )*@([a-z0-9_][-a-z0-9_]*(\.[-a-z0-9_] )*\.(aero|arpa|biz|com|coop|edu|gov|info|int|mil|museum|name|net|org|pro|travel|mobi|[a-z][a-z])|([0-9]\.[0-9]\.[0-9]\.[0-9]))(:[0-9])? $/i My knowledge of regular expressions is not that good.If the data entered by a client was incorrect or was simply missing, the server would have to send all the data back to the client and request that the form be resubmitted with correct information.This was really a lengthy process which used to put a lot of burden on the server.Sure there have been all kinds of whacky plug-ins over the years aimed at achieving this, but never a single standard that we could work towards.

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function check_email(val) check_email('[email protected]'); // Returns false check_email('[email protected]'); // Returns false check_email(' [email protected]'); // Returns false check_email('[email protected]'); // Returns true function valid Mail(mail) // VALID MAILS valid Mail('[email protected]') // Return true valid Mail('[email protected]') // Return true valid Mail('[email protected]') // Return true valid Mail('[email protected]') // Return true valid Mail('[email protected]') // Return true valid Mail('user mailbox/[email protected]') // Return true valid Mail('"very.(),:;[]:,;@\\"! ^_`| ~.a"@example.org') // Return true valid Mail('"[email protected]"@example.com') // Return true valid Mail('"Fred Bloggs"@example.com') // Return true valid Mail('"Joe.\Blow"@example.com') // Return true valid Mail('Loïc.

For these examples we have created our own valid/invalid CSS formatting to override the browser default. That's why you may see something like the following: Before you type anything into the box a red marker is shown.

As soon as a single character has been entered this changes to a green marker to indicate that the input is 'valid'.

Also each browser has a slightly different default behaviour.

The simplest change you can make to your forms is to mark a text input field as 'required': This informs the (HTML5-aware) web browser that the field is to be considered mandatory.

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