从字符串变量中丢失最后3个字符

Question

如果我的字符串（结果）中的最后4个字符是“AND”或最后三个字符是“OR”我想从字符串中删除它们。到目前为止，我一直在尝试使用result.trimend和其他一些方法，但我不确定如何让它工作。

由于

Answer 1

你也可以使用正则表达式：

Dim regex As New Regex("\s$|\s?and\s?|\s?or\s?", RegexOptions.IgnoreCase)

Dim mystring As String = "asdfasd AND "
mystring = regex.Replace(mystring, "")

Answer 2

Dim yourString as string = "sfsdsfd OR "

yourString = CleanString(yourString)



Function CleanString(byval theString as String) as String
    'clean the last spaces
    theString = theString.TrimEnd()

    If theString .EndsWith("OR")) Then
        theString = theString .Substring(0, yourString.Length - 2)
    Else if yourString.EndsWith("AND")) Then
        theString = theString .Substring(0, yourString.Length - 3)
    End If

    Return theString
End Function