According to RFC 3696 - apostrophes are valid characters in an email address, at least before the @ sign.
Formit’s email validation appears to disagree and flags such an address as invalid.
I think the relevant file / line might be:
assets/core/components/formit/src/FormIt/Validator.php - Line 430:
$pattern = "^(([A-Za-z0-9!#$%&'*+\/=?^_`{|}~-][A-Za-z0-9!#$%&'*+\/=?^_`{|}~\.-]{0,63})|(\"[^(\\|\")]{0,62}\"))$";
This stuff hurts my head but it kind of looks like it should allow the ’ symbol.
This site does use Formalicious to manage the forms but I think the validation comes from Formit.
I can’t see this issue popping up very often but I have a client who’d like to have it fixed.
Any thoughts gratefully received!
MODX 2.8.4-pl Formit 4.2.7-pl PHP 8.1.6