我想用一个数字范围（0 到 20）分割一个字符串，字母应该是 .toLower
如何在我的代码中定义范围？
我试过这样做：("0","1","2","3")
Dim Tolerancevalueofext As String = "JS12"
Dim removenumber As String = Tolerancevalueofext.Substring(0, Tolerancevalueofext.IndexOf("0","1","2","3")).ToLower
但这绝对是错误的。
您的要求我很不清楚，但这里有一种方法：
1. 仅从字符串中提取数字（使用Regex）。
2.从包含数字的字符串中只提取字母并将它们转换为小写字母。
Private Sub Example()
Dim Tolerancevalueofext As String = "JS12"
' only numbers, output: "12"
Dim onlynumbers As String = extractNumberFromString(Tolerancevalueofext).ToString()
' only characters, output: "js"
Dim onlycharacters As String = String.Empty
For Each line As String In Tolerancevalueofext
If Not (IsNumeric(line)) Then
onlycharacters += line.ToLower()
End If
Next
End Sub
Public Shared Function extractNumberFromString(ByVal value As String) As Integer
Dim returnVal As String = String.Empty
Dim collection As System.Text.RegularExpressions.MatchCollection = System.Text.RegularExpressions.Regex.Matches(value, "\d+")
For Each m As System.Text.RegularExpressions.Match In collection
returnVal += m.ToString()
Next
Return Convert.ToInt32(returnVal)
End Function
输出：
onlynumbers = "12"
onlycharacters = "js"
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