{"$schema":"http://json-schema.org/draft-07/schema#","$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]}]}