如何在vb.net中提取邮件正文中的img标记

你可以使用 正则表达式 .

Try
    Dim RegexObj As New Regex("<img[^>]+src=[""']([^""']+)[""']", RegexOptions.Singleline Or RegexOptions.IgnoreCase)
    Dim MatchResults As Match = RegexObj.Match(SubjectString)
    While MatchResults.Success
        ' SRC attribute is in MatchResults.Groups(1).Value
        MatchResults = MatchResults.NextMatch()
    End While
Catch ex As ArgumentException
    'Syntax error in the regular expression (which there isn't)
End Try

它的工作原理如下:

<img[^>]+src=["']([^"']+)["']

Match the characters "<img" literally «<img»
Match any character that is not a ">" «[^>]+»
   Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Match the characters "src=" literally «src=»
Match a single character present in the list ""'" «["']»
Match the regular expression below and capture its match into backreference number 1 «([^"']+)»
   Match a single character NOT present in the list ""'" «[^"']+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Match a single character present in the list ""'" «["']»