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# InStr Function

傳回某個字串在另一字串中的位置。

Instr 函式傳回兩個字串相符的位置。如果在另一個字串中未找到給定的字串，則函式傳回 0。

### Syntax:

    InStr ([Start As Long,] String1 As String, String2 As String[, Compare]) As Integer

### Return value:

Integer

### Parameters:

Start: A numeric expression that marks the position in a string where the search for the specified substring starts. If you omit this parameter, the search starts at the first character of the string. The minimum allowed value is 1. The maximum allowed value is 2,147,483,648.

String1: The string expression that you want to search.

String2: The string expression that you want to search for.

Compare: Optional numeric expression that defines the type of comparison. The value of this parameter can be 0 or 1. The default value of 1 specifies a text comparison that is not case-sensitive. The value of 0 specifies a binary comparison that is case-sensitive.

To avoid a run-time error, do not set the Compare parameter if the first optional parameter is omitted.

### 錯誤代碼：

5 無效的程序呼叫

## 示例：

    Sub ExamplePosition
    Dim sInput As String
    Dim iPos As Integer
        sInput = "Office"
        iPos = Instr(sInput,"c")
        Print iPos
    End Sub