[Twirrim]

Email address specs turn out to be rather complicated.

I really wish people wouldn't code their own checks rather than use already existing standards. Some languages like Java even include proper checks in their standard library: https://java.net/projects/javamail

Several jobs back I had no end of arguments with some Java devs about not writing their own checks, that kept routinely failing on legitimate addresses.

[soco]

But why do you even need to validate that email? Send the subscriber a confirmation link - if they get it then it was valid, if not then it's on them to fix the situation in whatever way they find fit.

[_yb2s]

A single massive and unreadable regex isn't an appropriate way to validate a spec that complex. With its complexity it can't be logically evaluated- only tested, whereas a function that breaks the spec out into steps/parts is going to be a lot more maintainable, readable, and auditable.

[smrtinsert]

It's all devs in general. As a java dev I have lost count of the number of times I have to tell any dev not to use a damn regex to validate emails.