Question

我有这个字符串123abc123我怎么才能从这个字符串中得到整数？

例如，将123abc123转换为123123。

我尝试了什么：

Integer.Parse(abc)

Answer 1

您可以使用Char.IsDigit

Dim str = "123abc123"
Dim onlyDigits = New String(str.Where(Function(c) Char.IsDigit(c)).ToArray())
Dim num = Int32.Parse(onlyDigits)

Answer 2

提取整数的正确方法是使用isNumbric函数：

Dim str As String = "123abc123"
Dim Res As String
For Each c As Char In str
    If IsNumeric(c) Then
        Res = Res & c
    End If
Next
MessageBox.Show(Res)

另一种方式：

Private Shared Function GetIntOnly(ByVal value As String) As Integer
    Dim returnVal As String = String.Empty
    Dim collection As MatchCollection = Regex.Matches(value, "\d+")
    For Each m As Match In collection
        returnVal += m.ToString()
    Next
    Return Convert.ToInt32(returnVal)
End Function

Answer 3

    Dim input As String = "123abc456"
    Dim reg As New Regex("[^0-9]")
    input = reg.Replace(input, "")
    Dim output As Integer
    Integer.TryParse(input, output)

Answer 4

您可以使用模式\D的正则表达式匹配非数字字符并删除它们，然后解析剩余的字符串：

Dim input As String = "123abc123"

Dim n As Integer = Int32.Parse(Regex.Replace(input, "\D", ""))

Answer 5

您还可以使用FindAll来提取所需内容。我们还应该考虑Val函数来处理空字符串。

    Dim str As String = "123abc123"
    Dim i As Integer = Integer.Parse(Val(New String(Array.FindAll(str.ToArray, Function(c) "0123456789".Contains(c)))))

Vb.net只从带有整数的字符串中获取整数

5 个答案: