ECHO: "Characters in string ("a"): [0]"
ECHO: "Characters in string ("adeq"): [[0, 5], [3, 8], [4], []]"
ECHO: "Default string search ("abe"): [0, 1, 8]"
ECHO: "Return all matches for string search ("abe"): [[0, 4, 9, 10], [1, 5], [8]]"
ECHO: "Return up to 2 matches for string search ("abe"): [[0, 4], [1, 5], [8]]"
ECHO: "Return up to 2 matches for string search; alternate columns ("aebe"): [[0, 4], [8], [1, 5], [8]]"
ECHO: "Default value search (3): [2]"
ECHO: "Value not found (4): []"
ECHO: "Value vector ([1,2]): [1]"
ECHO: "Default number search (7): [5]"
ECHO: "Return all matches for number search (1): [0, 4, 10]"
ECHO: "Return up to 2 matches for number search (1): [0, 4]"
ECHO: "Default list number search ([1, 3, 1000]): [0, 1, []]"
ECHO: "Default list string search (["b", "zzz", "a", "c", "apple", "dog"]): [1, [], 4, 2, 9, 3]"
ECHO: "Default list mixed search (["b", 4, "zzz", "c", "apple", 500, "a", ""]): [1, 3, [], 2, 9, [], 4, []]"
ECHO: "Return all matches for mixed search (["b", 4, "zzz", "c", "apple", 500, "a", ""]): [[1, 5], [3], [], [2, 6], [9], [], [4, 10], []]"
ECHO: "Return all matches for mixed search; alternate columns ([1, "zz", "dog", 500, 11]): [[0], [], [3], [], [10]]"
