[
 {
  "op": "add",
  "path": "/properties/Roles/maxItems",
  "value": 1
 },
 {
  "op": "add",
  "path": "/properties/Roles/minItems",
  "value": 1
 },
 {
  "op": "add",
  "path": "/properties/Roles/items/pattern",
  "value": "[a-zA-Z0-9+=,.@\\-_]+"
 }
]
