To fix this problem, you implement an activation system where, after registering, I am sent an email with a link I must click.
This is to verify that I actually own that email address before my account is activated.
If your user enters a bad email address, they won’t get the activation email and they’ll try to register again if they really care about using your site. Enterprising individuals will just copy and paste, but what it comes down to is this: if your user enters a bad email address, you shouldn’t make it more of a problem for yourself than you have to.
But a few large cities are represented by a single letter (L for Liverpool, G for Glasgow, etc.).
Still in the outward code, the letters are followed by one or two digits. So BS1 is the central part of Bristol, while G12 covers Glasgow's West End.
If you actually check the Google query I linked above, people have been writing (or trying to write) RFC-compliant regular expressions to parse email addresses for years.
But what if I told you there were a way to determine whether or not an email is valid without resorting to regular expressions at all? The activation email is a practice that’s been in use for years, but it’s often paired with complex validations that the email is formatted correctly.
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You should always retain a copy of your tax return.