将列表与列表进行比较，过滤/忽略时间戳

Question

我正在尝试创建一个程序，用于根据文件 A（已知良好）验证文件 B（潜在不良）的内容，并从潜在不良文件中删除每个已知良好行，只留下潜在不良行。我遇到的问题是每一行都包含一个时间戳。如何验证时间戳之后开始的行的内容？

I.E.文件 A：

MSI (c) (74:80) [08:09:43:718]: Resetting cached policy values
MSI (c) (74:80) [08:09:43:718]: Machine policy value 'Debug' is 0
MSI (c) (74:80) [08:09:43:718]: ******* RunEngine:

与文件 B：

MSI (c) (E8:DC) [18:35:18:573]: Resetting cached policy values
MSI (c) (E8:DC) [18:35:18:573]: Machine policy value 'Debug' is 0
MSI (c) (E8:DC) [18:35:18:573]: ******* RunEngine:

这些都应该被认为是平等的。 我没有一个不同的例子，但它基本上是一旦这些被删除后剩下的任何东西。

到目前为止我的代码：

Public Class Form1
Dim compto As New List(Of String)
Dim compfrom As New List(Of String)

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Standard("filea.LOG")
    Readfile("fileb.LOG")
    Writefile("difference.txt")
End Sub


Public Sub Standard(ByVal Path As String)
    Using r As StreamReader = New StreamReader(Path)
        Dim line As String = Nothing
        line = r.ReadLine
        Do While (Not line Is Nothing)
            line = r.ReadLine
            If Not compto.Contains(line) Then compto.Add(line)
        Loop
    End Using
End Sub

Public Sub Readfile(ByVal Path As String)
    Dim pattern As String = "{30}([A-Za-z0-9\-]+"
    Using r As StreamReader = New StreamReader(Path)
        Dim line As String = Nothing
        line = r.ReadLine
        Do While (Not line Is Nothing)
            line = r.ReadLine
            If Not compto.Contains(line) Then compfrom.Add(line)
        Loop
    End Using
End Sub

Public Sub Writefile(ByVal Path As String)
    Using sw As StreamWriter = New StreamWriter(Path)
        For Each line As String In compfrom
            sw.WriteLine(line)
            ListBox1.Items.Add(line)
        Next
    End Using
End Sub

End Class

到目前为止，此代码将删除完全匹配，但这就是我卡住的地方。任何帮助都会很棒。

谢谢。

解决方案编辑：

Public Sub Writefile(ByVal Path As String)
    Dim GetLine As Func(Of String, String) = Function(line) Regex.Match(line, "\]: (.*)").Groups(1).Value
    Dim Diff As New HashSet(Of String)(File.ReadLines("filea.log").Select(GetLine))
    Diff.SymmetricExceptWith(File.ReadLines("fileb.log").Select(GetLine))
    Using sw As StreamWriter = New StreamWriter(Path)
        For Each line As String In Diff
            sw.WriteLine(String.Join("", line))
            ListBox1.Items.Add(String.Join("", line))
        Next
    End Using
End Sub

Answer 1

基于this 链接，试试这个：

Dim GetLine As Func(Of String,String) = Function(line) Regex.Match(line,"\]: (.*)").Groups(1).Value

'IF the timestamp is always at the same position, it may be more efficient to 
'avoid regular expressions. YMMV
GetLine = Function(line) line.Substring(32)

Dim Diff = New HashSet(File.ReadLines("filea.LOG").Select(GetLine))
Diff.SymmetricExceptWith(File.ReadLines("fileb.LOG").Select(GetLine))

Answer 2

您似乎正在将File A 中的每一行与File B 中的每一行进行比较，并且行标题MSI (c) (74:80) [08:09:43:718]: 与此比较无关，并且它的长度是恒定的。

您可能会更改您的代码（4 个实例）：

line = r.ReadLine

到：

line = r.ReadLine.Substring(32)

Substring() 带一个整数参数，返回字符串从指定字符位置开始的剩余部分。