EmailOrEmptyString

Maximum string length: 255

Pattern: ^$|(^([!#-'*+\/-9=?A-Z^-~-]+(\.[!#-'*+\/-9=?A-Z^-~-]+)*|"([]!#-[^-~ \t]|([\t -~]))+")@([!#-'*+\/-9=?A-Z^-~-]+(\.[!#-'*+\/-9=?A-Z^-~-]+)*|[\t -Z^-~]*)$)

Example:

{
  "title": "Example",
  "value": "[e-mail]"
}