VB.NET取得字符串中所有的数字：

1.用正则表达式：

    '引入命名空间
    Imports System.Text.RegularExpressions
    Public Shared Function GetNumbers(ByVal str As String) As String
        Return Regex.Replace(str,"[a-z]","",RegexOptions.IgnoreCase).Trim()
    End Function

2.写一个函数

   '''   <summary>   
    '''   从字符串中提取所有数字   
    '''     Returns：所有数字   
    '''   </summary>     
    '''   <param  name = "strp">需要提取的字符串   </param>   
    '''   <returns> 所有数字</returns>   
    Private Function GetNumbers(ByVal strp As String) As String
        Dim strReturn As String = String.Empty
        If strp Is Nothing OrElse strp.Trim() = "" Then
            strReturn = ""
        End If
        For Each chrTemp As Char In strp
            If [Char].IsNumber(chrTemp) Then
                strReturn += chrTemp.ToString()
            End If
        Next
        Return strReturn
    End Function