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INDEX_OF (NoSQL query)

  • บทความ

APPLIES TO: NoSQL

Returns the starting index of the first occurrence of a substring expression within a specified string expression.

Syntax

INDEX_OF(<string_expr_1>, <string_expr_2> [, <numeric_expr>])

Arguments

Description
string_expr_1 A string expression that is the target of the search.
string_expr_2 A string expression with the substring that is the source of the search (or to search for).
numeric_expr (Optional) An optional numeric expression that indicates where, in string_expr_1, to start the search. If not specified, the default value is 0.

Return types

Returns a numeric expression.

Examples

The following example returns the index of various substrings inside the larger string "AdventureWorks".

SELECT VALUE {
    indexOfFirstLetter: INDEX_OF("AdventureWorks", "A"),
    indexOfLastLetter: INDEX_OF("AdventureWorks", "s"),
    indexOfPrefix: INDEX_OF("AdventureWorks", "Adventure"),
    indexOfSuffix: INDEX_OF("AdventureWorks", "Works"),
    indexOfSubstring: INDEX_OF("AdventureWorks", "tureW"),
    indexOfNonMatch: INDEX_OF("AdventureWorks", "Cosmos"),
    indexOfCustomStartMatch: INDEX_OF("AdventureWorks", "Works", 5),
    indexOfCustomStartNoMatch: INDEX_OF("AdventureWorks", "Adventure", 5),
    indexOfCaseSensitive: INDEX_OF("AdventureWorks", "aD")
}

[
  {
    "indexOfFirstLetter": 0,
    "indexOfLastLetter": 13,
    "indexOfPrefix": 0,
    "indexOfSuffix": 9,
    "indexOfSubstring": 5,
    "indexOfNonMatch": -1,
    "indexOfCustomStartMatch": 9,
    "indexOfCustomStartNoMatch": -1,
    "indexOfCaseSensitive": -1
  }
]

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