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FILTER_VALIDATE_EMAIL will erroneously balk at email addresses with long domain names (64 characters or more), and at email addresses with escaped characters (such as "me\"@example.com").
Now that you have your easy answer feel free to read on about email address validation if you care to learn or otherwise just use the fast answer and move on. Trying to validate an email address using a regex is an "impossible" task.
Through strategic market focus, innovative product application development and excellent customer support services, HPL has played the role of a catalyst in emergence of more than 500 downstream processing industries in West Bengal with a capacity to process more than 3,50,000 TPA of polymers and generating more than 1,50,000 employment opportunities in the process.
By popular demand, here are some basic instructions for setting up a form handler in PHP to verify user input and send an email or display an error message in case the validation fails.
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A symbol of industrial resurgence in West Bengal, HPL has led the economic growth of the region by propelling significant investments in downstream processing industries, which generate huge employment opportunities for skilled and unskilled workers.
Haldia Petrochemicals Ltd is a modern naphtha based Petrochemical Complex located 125 kms from Kolkata, at Haldia, West Bengal, India.
And you must remember that some concrete internet servers can fail some details of common standard and in fact work with own "modified standard". There are lot of servers which works not by standards or not by FRESH standards. If you type some regexp once, and validate only by that, you have no guarantee that it will stay right in future and your future users will not fail with their "new-way" emails. Also, once more I notice, that not all email-serving severs works strictly accordingly to common and modern standard of email adresses. Well I guess he might say: Browser email check (client side) is not secure at all.
So, my position is the same: main point if you want to verify email address - just send activation [email protected], well, for example, there's an concrete version of PHP on your server and you can't update it to newest. Anyone can send anything to a server by changing the code.
But you must accept the address "[email protected]" if user really want it. But you have old function on server, you cant update in some cases.
Also, you must remember that email address standard was and can evolute, so you can't just type some "standard-valid" regexp once and for all times. Just say me please, according what RFC the server assumes that [email protected] [email protected] the same address? And you will loose clients with some new valid emails.
I would go as far as to say that that regex you have made is useless.