{
  "openapi": "3.1.0",
  "info": {
    "title": "OpenAPI 3.1.0 pattern properties example",
    "version": "1"
  },
  "paths": {
    "/pattern-test": {
      "post": {
        "summary": "Test pattern properties",
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/PatternPropertiesTest"
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Success",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/PatternPropertiesResponse"
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "PatternPropertiesTest": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string"
          },
          "metadata": {
            "$ref": "#/components/schemas/MetadataObject"
          }
        },
        "additionalProperties": false
      },
      "MetadataObject": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string"
          },
          "description": {
            "type": "string"
          }
        },
        "patternProperties": {
          "^meta_": {
            "type": "string",
            "description": "Any property starting with 'meta_' must be a string"
          },
          "^config_": {
            "type": "object",
            "properties": {
              "value": {
                "type": "string"
              },
              "enabled": {
                "type": "boolean"
              }
            },
            "additionalProperties": false
          },
          "^tag_[a-zA-Z0-9_]+$": {
            "type": "string",
            "description": "Tag properties must match pattern and be strings"
          },
          "^[0-9]+_item$": {
            "type": "array",
            "items": {
              "type": "string"
            },
            "description": "Numbered item properties must be arrays of strings"
          }
        },
        "additionalProperties": false
      },
      "NestedPatternObject": {
        "type": "object",
        "properties": {
          "base": {
            "type": "string"
          }
        },
        "patternProperties": {
          "^nested_": {
            "type": "object",
            "patternProperties": {
              "^sub_": {
                "type": "string"
              }
            },
            "additionalProperties": false
          }
        },
        "additionalProperties": false
      },
      "UnionPatternObject": {
        "type": "object",
        "properties": {
          "type": {
            "type": "string",
            "enum": ["user", "admin", "guest"]
          }
        },
        "patternProperties": {
          "^user_": {
            "oneOf": [
              {
                "type": "string"
              },
              {
                "type": "number"
              }
            ]
          },
          "^admin_": {
            "allOf": [
              {
                "type": "object"
              },
              {
                "properties": {
                  "level": {
                    "type": "number",
                    "minimum": 1,
                    "maximum": 10
                  }
                }
              }
            ]
          }
        },
        "additionalProperties": false
      },
      "PatternPropertiesResponse": {
        "type": "object",
        "properties": {
          "success": {
            "type": "boolean"
          },
          "data": {
            "$ref": "#/components/schemas/MetadataObject"
          }
        },
        "additionalProperties": false
      }
    }
  }
}