How do I tell it to generate a regex for emails? Try selecting the emails. all four generated Regexes are wrong. Even if one of them was right? how do I choos

How do I tell it to generate a regex for emails? Try selecting the emails. all four generated Regexes are wrong. Even if one of them was right? how do I choose between 4 choices if I Don't know the meaning? I have to verify the generated Regexes, Veryfing complicated regexes is much harder than writing them in first place.