By Mike Lewis If your database contains UK address data, it's especially important that the postcodes are correctly stored.
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This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, Math ML, etc.
It’s surprisingly easy, and you’re probably already doing it anyway. If you’re going to send an activation email to users, why bother using a gigantic regular expression?
Think about it this way: I register for your website under the email address . That’s probably going to bounce off of the illustrious mail daemon, but the formatting is fine; it’s a valid email address.
You should always retain a copy of your tax return.
Here’s a fairly common code sample from Rails Applications with some sort of authentication system: If you’re experienced at Regex, this seems simple. Sections 3.2.4 and 3.4.1 of the RFC go into the requirements on how an email address needs to be formatted and, well, there’s not much you can’t do in your email address when quotes or backslashes are involved.
However, it's relatively easy to check the syntax of a postcode.
That won't tell you if the code actually exists, but it will flag up any codes that are not in the correct format. It usually consists of one or two letters, followed by one or two digits.
Generally, tax software automatically enters the information for returning customers.
If you are using a software product for the first time, you may have to enter the information yourself.
At this point, why keep parsing email addresses for their format?