從vb.net中的字符串中提取字符

Question

我正忙於處理過去的考試卷，為下周的vb.net考試做准備。 我正在努力解決的問題如下。

接收一長串字母字符和特殊字符，將字母字符提取為string1並將特殊字符提取為string2

所以字符串hello：// thisismystring !? 必須顯示如下

string1 = hellothisismystring
string2 = ://!?

我的問題是如何從字符串中提取字符並將其存儲在變量中？

Answer 1

一種對Unicode友好，干凈且容易的方法。

Imports System.Text

Module Module1

    Sub Main()
        Dim sValue As String = "hello://thisismystring!?"
        Dim a As New StringBuilder
        Dim b As New StringBuilder
        For Each c As Char In sValue
            If Char.IsLetter(c) Then
                a.Append(c)
            Else
                b.Append(c)
            End If
        Next
        Dim s1 As String = a.ToString()
        Dim s2 As String = b.ToString()
    End Sub

End Module

Answer 2

您可以遍歷該字符串中的字符，並使用ASCII代碼確定當前字符是否為字母，如果是-> string1，如果不是-> string2。 祝好運。

Answer 3

這是一種方法

    Dim allText As String = "Hello139874098@#4this204985"
    Dim onlyLetters As String = ""
    Dim nonLetters As String = ""
    For i = 0 To allText.Length - 1
        Dim c As String = allText.Substring(i, 1)
        If c.ToUpper >= "A" And c.ToUpper <= "Z" Then
            onlyLetters &= c
        Else
            nonLetters &= c
        End If
    Next
    MsgBox("Letters are " & onlyLetters)
    MsgBox("Non-Letters are " & nonLetters)

Answer 4

我會用這個：

    Dim SearchString = "hello://thisismystring!?"
    Dim ToFind = "://!?"


    Dim ResultSpecial As String = ""
    Dim ResultNormal As String = ""

    Dim ChrList As New List(Of Char)

    For Each c In ToFind
        ChrList.Add(c)
    Next

    For i = 0 To SearchString.Length - 1
        Dim c = SearchString(i)
        If ChrList.Contains(c) = True Then
            ResultSpecial = ResultSpecial & c
        Else
            ResultNormal = ResultNormal & c
        End If
    Next

    Debug.Print("Resultnormal: " & ResultNormal)
    Debug.Print("ResultSpecial: " & ResultSpecial)

您必須將所有所需的Character寫入“ ToFind”中，正則表達式會更好，但有時會很麻煩。

重做版本

Module Module1

    Sub Main()
        Dim SearchString = "hello://thisismystring!?"
        Dim ToFind = "://!?"

        Dim ResultSpecial As String = ""
        Dim ResultNormal As String = ""

        For Each c In SearchString
            If ToFind.Contains(c) Then
                ResultSpecial = ResultSpecial + c
            Else
                ResultNormal = ResultNormal + c
            End If
        Next

        Debug.WriteLine(ResultNormal, "Resultnormal")
        Debug.WriteLine(ResultSpecial, "ResultSpecial")
    End Sub

End Module