How can VBA determine if this string contains numbers?

You can use the IsNumeric function in VBA to determine if a string contains numbers. This function will return a Boolean value, True if the string can be parsed as a number, and False if not.

Here is an example code showing how to use the IsNumeric function to determine if a string contains numbers:

Sub CheckStringForNumbers()
    Dim inputString As String
    Dim containsNumbers As Boolean
    
    ' 获取用户输入的字符串
    inputString = InputBox("请输入一个字符串：")
    
    ' 判断字符串是否含有数字
    containsNumbers = IsNumeric(inputString)
    
    ' 显示判断结果
    If containsNumbers Then
        MsgBox "字符串含有数字。"
    Else
        MsgBox "字符串不含有数字。"
    End If
End Sub

When this code is executed, it will prompt the user with an input box to enter a string. The code will then determine if the input string contains any numbers, and display the result of the evaluation in a message box.

Please note that the IsNumeric function will also interpret strings containing punctuation marks, decimal points, and currency symbols as numbers. If you only want to determine if a string contains only integer numbers, you can use other methods, such as a custom function or regular expression.