使用RegEx查找VBA注释

Question

我试图使用正则表达式查找所有VBA注释.我有一些主要有用的东西,但有一些我无法弄清楚的例外.

我正在使用的表达式:

'(?!.*").*

拿我们的测试代码:

Working - This is a test 'This should be captured
Working - "this is a test" 'This should be captured
Not Working - "this is a test" 'This should be "captured"
Not Working - This is a test 'This should be "captured"
Working - "this is a test 'this should not capture'" 'this should capture
Working - "this isn't a test" 'this should capture

以下是RegExr中此示例的链接:http: //regexr.com/3f24h

由于某种原因,第三和第四个例子没有捕获.问题似乎是在评论中有一个字符串值,我无法弄清楚如何解决它.

有什么建议？

Answer 1

你无法在VBA代码中找到所有注释(更不用说字符串文字)和正则表达式 - 句点.相信我,我在Rubberduck的Smart Indenter模块工作期间尝试过(如果不够明确 - 完全披露,我是贡献者).您需要实际解析代码.您将遇到的第一个问题是续行:

'Comment with a line _
continuation

Debug.Print 'End of line comment _
with line continuation.

Debug.Print 'Multiple line continuation operators _ _
still work.

Debug.Print 'This is actually *not* a line continuation_
Debug.Print 42

这使得识别字符串文字很困难,尤其是您使用逐行处理:

Debug.Print 42 'The next line... _
"...is not a string literal"

您还必须处理旧的Rem注释语法...

Rem old school comment

......也支持线路延续:

Rem old school comment with line _
continuation.

你可能会想"不可能这么糟糕,Rem必须开始行".如果你是,你忘记了语句分隔符(:)...

Debug.Print 42: Rem statement separator comment.

...或其邪恶的双胞胎语句分隔符与行继续结合:

Debug.Print 42: Rem this can be _
continued too.

你解决了一些问题,包括整理字符串文字和这些评论......

Debug.Print "Unmatched double quotes." 'Comment"
Debug.Print "Interleaved single 'n double quotes." 'Comment"

...但是像这种野兽的括号标识符(由@ThunderFrame提供)呢？

'No comments or strings in the line below.
Debug.Print [Evil:""Comment"'here] 

请注意,SO使用的语法高亮显示甚至没有捕获所有这些奇怪的角落情况.