I understand that email validation used to be a thing in the FBA Pack for the forms. Was it ever brought back? How can it be done? Would settled for an option to just look for an "@" in the email box
The new/edit user pages only checks for an @ in the email box. You can see the change that was made here:
https://sharepoint2013fba.codeplex.com/SourceControl/diff/file/view/eb096fcd91cf?fileId=Visigo.Sharepoint.FormsBasedAuthentication%2FVisigo.Sharepoint.FormsBasedAuthentication%2FLayouts%2FFBA%2FMANAGEMENT%2FUserEdit.aspx&olderChangeSetId;=2b129d28161c
(Note that i'm including a link to the SharePoint 2013 source code, as the 2010 source code appears to be down right now in Codeplex for some reason.
https://sharepoint2013fba.codeplex.com/SourceControl/diff/file/view/eb096fcd91cf?fileId=Visigo.Sharepoint.FormsBasedAuthentication%2FVisigo.Sharepoint.FormsBasedAuthentication%2FLayouts%2FFBA%2FMANAGEMENT%2FUserEdit.aspx&olderChangeSetId;=2b129d28161c
(Note that i'm including a link to the SharePoint 2013 source code, as the 2010 source code appears to be down right now in Codeplex for some reason.