Question

我正在尝试创建一个从字符串中返回一个或多个匹配的正则表达式，这让我疯狂。

(?<=\x03).*?(?=\r)

以上应该是寻找ETX（Char 3）的开始字符和Carriage return的结束字符。

我希望每个开始和结束字符之间的文本“阻止”。

我做错了什么？

Answer 1

实际上不理我它确实有效。我想在调试一个匹配属性时看起来很困惑。一个小测试证明它没问题（在VB中）。

    Dim TestString1 As String = Chr(3) & "Some Text to Extract 1" & Chr(13)
    Dim TestString2 As String = Chr(3) & "Some Text to Extract 2" & Chr(13)
    Dim TestString3 As String = Chr(3) & "Some Text to Extract 3" & Chr(13)

    Dim TestString As String = TestString1 & " random noise " & TestString2 & " more random noise " & TestString3
    Dim Matches As MatchCollection = Regex.Matches(TestString, "(?<=\x03).*?(?=\r)")

    Dim Index As Integer = 0
    Dim result As New StringBuilder
    result.Append("No of Matches found = " & Matches.Count & vbCrLf & vbCrLf)
    For Each m As Match In Matches
        Index += 1
        result.Append(Index & ": " & m.Groups(0).Value & vbCrLf)
    Next

    MessageBox.Show(result.ToString())

正则表达式与不可打印的字符问题

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