Select 关键词之间的文字

Question

这是 Select block of text and merge into new document

的后续问题

我有一个 SGM 文档，其中添加了注释，并且在我的 sgm 文件中有注释。我需要提取 start/stop 注释之间的字符串，以便将它们放入临时文件中进行修改。现在它正在选择所有内容，包括 start/stop 评论和 start/stop 评论之外的数据。

Dim DirFolder As String = txtDirectory.Text
Dim Directory As New IO.DirectoryInfo(DirFolder)
Dim allFiles As IO.FileInfo() = Directory.GetFiles("*.sgm")
Dim singleFile As IO.FileInfo
Dim Prefix As String
Dim newMasterFilePath As String
Dim masterFileName As String
Dim newMasterFileName As String
Dim startMark As String = "<!--#start#-->"
Dim stopMark As String = "<!--#stop#-->"
searchDir = txtDirectory.Text
Prefix = txtBxUnique.Text

For Each singleFile In allFiles
    If File.Exists(singleFile.FullName) Then
        Dim fileName = singleFile.FullName
        Debug.Print("file name : " & fileName)
        ' A backup first    
        Dim backup As String = fileName & ".bak"
        File.Copy(fileName, backup, True)

        ' Load lines from the source file in memory
        Dim lines() As String = File.ReadAllLines(backup)

        ' Now re-create the source file and start writing lines inside a block
        ' Evaluate all the lines in the file.
        ' Set insideBlock to false
        Dim insideBlock As Boolean = False
        Using sw As StreamWriter = File.CreateText(backup)
            For Each line As String In lines
                If line = startMark Then
                    ' start writing at the line below
                    insideBlock = True
                    ' Evaluate if the next line is <!Stop>
                ElseIf line = stopMark Then
                    ' Stop writing
                    insideBlock = False
                ElseIf insideBlock = True Then
                    ' Write the current line in the block
                    sw.WriteLine(line)
                End If
            Next
        End Using
    End If

Next

这是要测试的示例文本。

<chapter id="Chapter_Overview"> <?Pub Lcl _divid="500" _parentid="0"> 
<title>Learning how to gather data</title>
<!--#start#-->
<section>
<title>ALTERNATE MISSION EQUIPMENT</title>
<para0 verdate="18 Jan 2019" verstatus="ver">
<title>
<applicabil applicref="xxx">
</applicabil>Three-Button Trackball Mouse</title>
<para>This is the example to grab all text between start and stop comments. 
</para></para0>
</section>
<!--#stop#-->

注意事项：开始和结束注释总是换行，一个文档可以有多个 start/stop 部分

我想也许可以在此使用正则表达式

(<section>[\w+\w]+.*?<\/section>)\R(<\?Pub _gtinsert.*>\R<pgbrk pgnum.*?>\R<\?Pub /_gtinsert>)*

或者可以使用 IndexOf 和 LastIndexOf，但我无法正常工作。

Answer 1

可以读取整个文件，使用{"", ""}的字符串数组拆分成一个数组，拆分成这个

元素 0：""
元素 1："" 和 ""
元素 2：""

并取出元素 1。然后将其写入备份。

Dim text = File.ReadAllText(backup).Split({startMark, stopMark}, StringSplitOptions.RemoveEmptyEntries)(1)
Using sw As StreamWriter = File.CreateText(backup)
    sw.Write(text)
End Using

编辑地址评论

我确实使原始代码紧凑了一点。它可以扩展为以下内容，允许您添加一些验证

Dim text = File.ReadAllText(backup)
Dim split = text.Split({startMark, stopMark}, StringSplitOptions.RemoveEmptyEntries)
If split.Count() <> 3 Then Throw New Exception("File didn't contain one or more delimiters.")
text = split(1)
Using sw As StreamWriter = File.CreateText(backup)
    sw.Write(text)
End Using

Select 关键词之间的文字

Select text between key words

vb.net

text-extraction