+ means that of the prepending selection of characters (those in the []-brackets) at least one character has to Match.
The curly braces are some advanced Form of that and means for {n,m} anything between n and m characters of the prepending selection. In this Case it would be at least 2 as m isn't given. This will Match any Domain ending With at least 2 characters.
Notice however that this is a very Basic regex pattern to Match Email addresses.
Ich kenne das Review von Alexibexi, das du ja bereits weiter unten verlinkt hast.
Dauert es wirklich so lange, bis die Anzeige aktualisiert wie im Video zu sehen ist oder hat sich da mittlerweile was getan?
Ich find das Teil auch ziemlich cool, ist mir aber viel zu teuer.