{
  "required": {
    "customMessage": [
      { "message": "Please fill this in" },
      { "message": "Required field" },
      { "message": "Cannot be empty" }
    ]
  },
  "email": {
    "validPatterns": [
      { "email": "test@example.com" },
      { "email": "user.name@domain.org" },
      { "email": "admin@sub.domain.co.uk" },
      { "email": "a@b.c" }
    ],
    "invalidPatterns": [
      { "email": "invalid" },
      { "email": "@nodomain.com" },
      { "email": "noat.com" },
      { "email": "spaces in@email.com" }
    ],
    "customMessage": [
      { "message": "Enter valid email address" },
      { "message": "Email format invalid" }
    ]
  },
  "minLength": {
    "rules": [
      { "length": 1 },
      { "length": 8 },
      { "length": 16 },
      { "length": 100 }
    ],
    "customMessage": [
      { "length": 8, "message": "Password must be 8+ characters" },
      { "length": 3, "message": "Username too short" }
    ]
  },
  "maxLength": {
    "rules": [
      { "length": 50 },
      { "length": 100 },
      { "length": 255 },
      { "length": 1000 }
    ]
  },
  "pattern": {
    "rules": [
      { "name": "phone", "regex": "^%d%d%d%-%d%d%d%-%d%d%d%d$", "message": "Invalid phone" },
      { "name": "alphanumeric", "regex": "^%w+$", "message": "Letters and numbers only" },
      { "name": "zip", "regex": "^%d%d%d%d%d$", "message": "Invalid ZIP code" }
    ],
    "matchTests": [
      { "regex": "^%d+$", "value": "12345", "expected": true },
      { "regex": "^%d+$", "value": "abc", "expected": false },
      { "regex": "^%w+$", "value": "test123", "expected": true },
      { "regex": "^%w+$", "value": "test 123", "expected": false },
      { "regex": "^%a+$", "value": "onlyletters", "expected": true }
    ]
  }
}