Tried to enter an email address with a '+' sign in it: "Email address is invalid".
No it's not.
No it's not.
.info domains have been around for 11 years now, and I can't work around these sites by removing a character.
You cannot be penalized in any way for sending email from a .info domain, so why don't so many websites accept them still?
validationexpression = "^([a-zA-Z0-9_\\-\\.]+)@[a-z0-9-]+(\\.[a-z0-9-]+)*(\\.[a-z]{2,3})$";
I run into it all over the place. I can't redeem reward points on my Visa card because the redemption 'shopping cart' requires an e-mail to notify you when the rewards ship, and says mine isn't valid. I was blocked signing up for a checking account online because of my "invalid" e-mail, but opened the same account at a branch with the same e-mail address, where they now e-mail my statements.
More realistly there will be unmaintained sites running old email validation coed for decades.