字母表中的Visual Basic问题 [英] Visual Basic problems in Alphabets

问题描述

我有一个textbox2.text，我声明这是一个字符串，即myletters

我也有一个label36.text我也声明这个字符串即模式



我只在文本框中输入的是仅从a到z的字母，并且有一个标签36的原因是，当我再次放入相同的字母时，它将显示错误消息。



这是我到目前为止的代码。

----------------- -------------------------------------------------- ----------------------

Imports System.Text.RegularExpressions

I have a textbox2.text and I declare this as a string namely myletters
and I also have a label36.text and i also declare this as a string namely patterns

I will only input on the textbox is letters from "a" to "z" only and the reason why there is a label36 is that when i put the same letter again it will show an error message.

This is my code so far.
-----------------------------------------------------------------------------------------
Imports System.Text.RegularExpressions

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Dim patterns As String
        patterns = Label36.Text
        Dim myletters As String
        myletters = TextBox2.Text
        Dim matches As MatchCollection = Regex.Matches(myletters, patterns)
        If Regex.IsMatch(patterns, myletters) Then
            MsgBox("You already typed this letter.")
        Else
            Label36.Text = Label36.Text + myletters + ","
            End If
    End Sub

< br $>




--------------------------- -------------------------------------------------- -----------



到目前为止，我的代码在顶部有什么用处，如果我已经再次输入相同的字母，则显示错误如果我不放相同的字母，请给这个。





示例输出：



套装A：a，b，c，d，e





现在这里是我的问题。

1.如何输入我的第一个字母而不用逗号？

例如：

a



但我的输出是

示例：

a，

2.如何将文本框设置为仅1个字母的最大输入？

3.如何在正确的时间和格式下放置逗号？

示例1：

a

示例2 ：

a，b

但我的例子是

示例1：

a，

示例2：

a， b，

4.如何在正确的位置安排字母？

示例1：

a，z

如果我输入x，输出必须是

例2：

a，x，z







谢谢，任何答案都将被接受TY。



SHOUTING已删除 - OriginalGriff [/ edit]

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What use on the top is my code so far that will show error if i already put a same letter again and give this if i dont put the same letters.


Example Output:

Set A: a,b,c,d,e


Now here is my questions.
1.How can i input my first letter without following a comma?
Example:
a

But my output is
Example:
a,
2.How can i set my textbox to the maximum of input of just 1 letter?
3.How can i put commas in right time and format?
Example 1:
a
Example 2:
a,b
But my example is
Example 1:
a,
Example 2:
a,b,
4.How can i arrange the alphabet letters in the right positions?
Example 1:
a,z
If i will input "x" the output must be
Example 2:
a,x,z



Thank you, any answer will be accepted TY.

[edit]SHOUTING removed - OriginalGriff[/edit]

推荐答案

有很多方法可以做到这一点，最简单的可能就是根本不使用正则表达式 - 请记住

There are a number of ways to do this, and the simplest is probably not to use a regex at all - bear in mind that

a,b

在你的标签中作为正则表达式正是如此：a'，后跟逗号，后跟a 'b' - 所以如果你的文字包含a，c则不匹配......



相反，考虑设置一个字符串列表，并添加你去的每一个新角色/>
然后，您可以检查列表是否已经使用List.Contains方法的字母，如果没有，则添加它。您可以使用List.Sort对列表进行排序，并使用string.Join为表示创建逗号分隔的字符串。

in your label as a regex looks for exactly that: an 'a', followed by a comma, followed by a 'b' - so if your text contains "a,c" it will not match...

Instead, think about setting up a List of strings, and add each new character to it as you go.
You can then check if the list has a letter already using the List.Contains method and add it if it doesn't. You can sort the list using List.Sort, and create a comma delimited string for presentation using string.Join.

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