{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "http://jsonlogic.com/schemas/operators/string/substr.json",

  "title": "substr",
  "description": "Get a portion of a string.\n\nGive a positive start position to return everything beginning at that index (Indexes of course start at zero).\nGive a negative start position to work backwards from the end of the string, then return everything.\nGive a positive length to express how many characters to return.\nGive a negative length to stop that many characters before the end.",
  "type": "object",
  "additionalProperties": false,
  "required": ["substr"],
  "properties": {
    "substr": {
      "$ref": "http://jsonlogic.com/schemas/common/trinary-args.json"
    }
  },
  "examples": [
    { "substr": ["jsonlogic", 4] },
    { "substr": ["jsonlogic", -5] },
    { "substr": ["jsonlogic", 1, 3] },
    { "substr": ["jsonlogic", 4, -2] }
  ]
}