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Instr (MDX)

Returns the position of the first occurrence of one string within another.

InStr([start, ]searched_string, search_string[, compare])

start

(Optional) A numeric expression that sets the starting position for each search. If this value is omitted, the search begins at the first character position. If start is null, the function return value is undefined.

searched_string

The string expression to be searched.

search_string

The string expression that is to be searched for.

Compare

(optional) An integer value. This argument is always ignored. It is defined for compatibility with other Instr functions in other languages.

An integer value with the starting position of String2 in String1.

Also, InStr function returns the values listed in the following table depending on the condition:

Condition

Return value

String1 is zero-length

zero (0)

String1 is null

undefined

String2 is zero-length

start

String2 is null

undefined

String2 is not found

zero (0)

start is greater than Len(String2)

zero (0)

Caution note Caution

Instr always performs a case-insensitive comparison.

The following example shows the usage of the Instr function and shows different result scenarios.

with 
    member [Date].[Date].[Results] as "Results"
    member measures.[lowercase found in lowercase string] as InStr( "abcdefghijklmnñopqrstuvwxyz", "o")
    member measures.[uppercase found in lowercase string] as InStr( "abcdefghijklmnñopqrstuvwxyz", "O")
    member measures.[searched string is empty]            as InStr( "", "o")
    member measures.[searched string is null]             as iif(IsError(InStr( null, "o")), "Is Error", iif(IsNull(InStr( null, "o")), "Is Null","Is undefined"))
    member measures.[search string is empty]              as InStr( "abcdefghijklmnñopqrstuvwxyz", "")
    member measures.[search string is empty start 10]     as InStr(10, "abcdefghijklmnñopqrstuvwxyz", "")
    member measures.[search string is null]               as iif(IsError(InStr( null, "o")), "Is Error", iif(IsNull(InStr( null, "o")), "Is Null","Is undefined"))
    member measures.[found from start 10]                 as InStr( 10, "abcdefghijklmnñopqrstuvwxyz", "o")
    member measures.[NOT found from start 17]             as InStr( 17, "abcdefghijklmnñopqrstuvwxyz", "o")
    member measures.[NULL start]                          as iif(IsError(InStr( null, "abcdefghijklmnñopqrstuvwxyz", "o")), "Is Error", iif(IsNull(InStr( null, "abcdefghijklmnñopqrstuvwxyz", "o")), "Is Null","Is undefined"))
    member measures.[start greater than searched length]  as InStr( 170, "abcdefghijklmnñopqrstuvwxyz", "o")


select  [Results] on columns,
       { measures.[lowercase found in lowercase string]
       , measures.[uppercase found in lowercase string]
       , measures.[searched string is empty]
       , measures.[searched string is null]
       , measures.[search string is empty]
       , measures.[search string is empty start 10]
       , measures.[search string is null]
       , measures.[found from start 10]
       , measures.[NOT found from start 17]
       , measures.[NULL start] 
       , measures.[start greater than searched length]
       } on rows

from [Adventure Works]

The following table displays the obtained results.

Results

lowercase found in lowercase string

16

uppercase found in lowercase string

16

searched string is empty

0

searched string is null

Is undefined

search string is empty

1

search string is empty start 10

10

search string is null

Is undefined

found from start 10

16

NOT found from start 17

0

NULL start

Is undefined

start greater than searched length

0

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