Returns the position of an occurrence of one string within another, from the end of string in an Access desktop database.
Syntax
InStrRev(stringcheck, stringmatch [, start[, compare]])
The InStrRev function syntax has these named arguments:
| Argument | Description |
|---|---|
| stringcheck | Required. String expression being searched. |
| stringmatch | Required. String expression being searched for. |
| start | Optional. Numeric expression that sets the starting position for each search. If omitted, –1 is used, which means that the search begins at the last character position. If start contains Null, an error occurs. |
| compare | Optional. Numeric value indicating the kind of comparison to use when evaluating substrings. If omitted, a binary comparison is performed. See Settings section for values. |
Settings
The compare argument settings are:
| Constant | Value | Description |
|---|---|---|
| vbUseCompareOption | -1 | Performs a comparison using the setting of the Option Compare statement. |
| vbBinaryCompare | 0 | Performs a binary comparison. |
| vbTextCompare | 1 | Performs a textual comparison. |
Return Values
| If | InStrRev returns |
|---|---|
| stringcheck is zero-length | 0 |
| stringcheck is Null | Null |
| stringmatch is zero-length | start |
| stringmatch is Null | Null |
| stringmatch is not found | 0 |
| stringmatch is found within stringcheck | Position at which match is found |
| start > Len(stringmatch) | 0 |
Remarks
Note that the syntax for the InStrRev function is not the same as the syntax for the InStr function.
Query examples
| Expression | Results |
|---|---|
| SELECT Names_InstrRev.*, InStrRev(FullName,"S") AS Expr1 FROM [Names_InstrRev]; | Returns the position of string "S" from the values in the column "FullName" from the table Names. |
| SELECT Names_InstrRev.*, InStrRev(FullName,"S",10) AS InStrTest FROM [Names_InstrRev]; | Returns the position of string "S" from the values in the column "FullName", starting from position 10 from the table Names and displays in the column InStrTest. |