INSTR([start] ,string1 ,string2 [,compare])

Returns the position of a substring within a larger string (Long).

start(Optional) The character position to start searching from (Integer).
string1The text string containing the text you want to find (String).
string2The substring to look for (String).
compare(Optional) A vbCompareMethod constant specifying the type of string comparison to use (Integer):
-1 = vbUseCompareOption (uses the "Option Compare" setting)
0 = vbBinaryCompare (default, case sensitive)
1 = vbTextCompare (not case sensitive)
2 = vbDatabaseCompare (uses an Access database)

* This function is case sensitive (by default).
* This function does not support wildcards (? and *).
* If "start" is left blank, then 1 is used. (i.e. you start searching from the first character).
* If "start" is 0, then a run-time error occurs.
* If "start" > 1, the position returned is still the position from the first character (not the start position).
* If "start" is Null, then an error occurs.
* If "string1" cannot be found in "string2" then 0 is returned.
* If "string1" = "string2" or "string1" is the beginning of "string2" then 1 is returned.
* If "compare" is left blank, then -1 is used. If there is no Option Compare statement provided then vbBinaryCompare (0) is used.
* If "compare" is Null, then an error occurs.
* You can use the INSTRREV function to return the position of a substring within a larger string, starting at the end.
* You can use the INSTR$ function to return a String data type instead of Variant data type.
* If you type in INSTR$ with valid arguments the editor will automatically change this function to just INSTR.
* You can use the INSTRB function that is used with byte data.
* You can use the MID function to return the text string which is a substring of a larger string.
* You can use the LIKE Operator to pattern match using wildcards.
* For more information, refer to the Finding Strings page.
* The equivalent .NET function is Microsoft.VisualBasic.Strings.InStr
* For the Microsoft documentation refer to

Debug.Print InStr("C:\Temp\", "C:\")               '= 1  
Debug.Print InStr(1, "C:\Temp\", "C:\") '= 1
Debug.Print InStr(1, "C:\Temp\", "E:\") '= 0
Debug.Print InStr(1, "somemoretext", "more") '= 5
Debug.Print InStr("somemoretext", "more") '= 5
Debug.Print InStr(4, "somemoretext", "more") '= 5 always counts from position 1
Debug.Print InStr("somemoretext", "somemoretext") '= 1
Debug.Print InStr("somemoretext", "nothing") '= 0
Debug.Print InStr("bettersolutions", "better") '= 1
Debug.Print InStr("bettersolutions", "solutions") '= 7

Dim lPosition As Long
lPosition = InStr("Monday", "day")
Debug.Print lPosition '= 4

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