Title Case
^[A-Z][a-z@./'\\]*([ \-][A-Z][a-z@./'\\]*)*$
Upper or Title Case
^[A-Z][A-Za-z@./'\\]*([ \-][A-Z][A-Za-z@./'\\]*)*$
Email Address:
^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$
^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*\\.([a-zA-Z]{2,5})$
Email Address: (without % or \\%)
^[a-zA-Z0-9\\.\\!#$&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*\\.([a-zA-Z]{2,5})$
References