Mid 函数, Mid 语句

目录

# Mid Function

Returns the specified portion of a string expression (Mid function), or replaces the portion of a string expression with another string (Mid subroutine).

### 语法:

    Mid(string As String, Start As Long [, Length As Long]) As String
    Mid([ByRef] string As String, Start As Long, [Length As Long], Text As String)

### 返回值:

字符串 (仅适用于函数)

### 参数:

string: Any string expression that you want to extract (Mid function). Any text variable name that you want to modify (Mid subroutine).

Start: Numeric expression that indicates the character position within the string where the string portion that you want to replace or to return begins. The minimum allowed value is 1. The maximum allowed value is 2,147,483,648.

Length: Numeric expression that returns the number of characters that you want to replace or return. The maximum allowed value is 2,147,483,648.

如果不指定「Mid 函数」中的 Length 参数，则返回字符串表达式中从开始位置到字符串结尾的所有字符。

If the Length parameter in the Mid subroutine is less than the length of the text that you want to replace, the text is reduced to the specified length.

Text: The string to replace the string expression (Mid subroutine).

### 错误代码:

5 无效的过程调用

### 示例:

    Sub ExampleMid_Function_and_Statement
      text = "This is the original Text"
    func1:
      MsgBox Mid(text, 13, 8)   ' returns the word "original"
      MsgBox text               ' text is not modified
    stmt1:
      Mid(text, 13, 8, "new")
      MsgBox text               ' returns "This is the new Text"
    func2:
      MsgBox Mid(start:=10, string:="The quick brown fox ..") ' shows " brown fox .."
    stmt2:
      Mid text, 9, 12, "a new Phrase"
      MsgBox text               ' returns "This is a new Phrase"
    End Sub

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String functions