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My problem is that the email will not be delivered to ALL the addresses in the comma delimited string, even though only SOME of the addresses are of the wrong format.

Also, I have no control over the design, or on how that address string comes to my function, I can't add the email validation in the UI, so I am helpless there...

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A valid email is of the format: [email protected] The name can be a set of ‘atoms’ separated by dots. single or double quotes and any character inside the quotes Now, to the domain part. MUSEUM .travel, .international or even .vermögensberatung For example all the following email addresses are valid: Source The sad truth is that despite the complex regular expression validation, the email may not be existing, so can still be invalid for practical purposes.

Most email validation checks assumes that the top level domain can have up to 4 characters. You have just validated the format – not its existence.

And then I verify if its a valid email address or not.

Like "[email protected]" would be valid, but "[email protected]@org" would be invalid.

Assuring an email address is of a good quality requires a combination of various validation techniques. If you want to define \w, then you must be using \w in your regex.

You can and should check every email address before sending a message.

I'm trying to write a little program where I ask the user to enter an email address.

Here's my code, I have made it work to detect if there is an @ and . If they're different, then this character is present multiple times. If you need only email validation, better use a specific validator, which will validate the email way more thoroughly.

character in there, but I need to make sure it only appears once, and that the @ appears before the dot (.) If anyone could help, it would be greatly appreciated! I'm posting the final code below if anyone else will be doing something similar in the future.

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