RESTInstance example - JSON Schema keyword `pattern` for testing if a JSON string contains something

RESTInstance_JSON_string_contains.robot

*** Settings ***
Library         REST

*** Test Cases ***
Use JSON Schema keyword pattern to test JSON string for substrings
    [Setup]     GET     https://jsonplaceholder.typicode.com/users/1

    # matches "Leanne Graham" as a substring:
    String      response body name        pattern="anne Grah"

    # quotes are not necessary, it is still read as a string by the library:
    String      response body name        pattern=anne Grah

    # pattern supports regular expressions:
    String      response body name        pattern=(sqilz|Leanne Graham)

    # checking that 'name' does not contain the word:
    String      response body name        pattern=^((?!asyrjasalo).)*$

https://json-schema.org/draft-04/json-schema-validation.html#rfc.section.5.2.3