Postgres 13

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CREATE TABLE search_test (
  id integer NOT NULL
, items jsonb NOT NULL DEFAULT '{}'::jsonb
, CONSTRAINT search_test_pkey PRIMARY KEY (id)
);
INSERT INTO search_test VALUES
  (1, '{"id": "15351", "nid": 15751 }')
, (2, '{"id": "15362", "nid": 15762 }')
;
CREATE INDEX search_test_path_ops_idx ON search_test USING GIN (items jsonb_path_ops);

CREATE TABLE

INSERT 0 2

CREATE INDEX

SELECT *
FROM   search_test u
WHERE  items @? '$.** ? (@ like_regex "35" flag "i")';

id
items

1
{"id": "15351", "nid": 15751}

SELECT 1

SELECT *
FROM   search_test u
WHERE  items @? '$.** ? (@ like_regex "75" flag "i")';

id
items

SELECT 0