Python 3正则表达式查找多行注释 [英] Python 3 regular expression to find multiline comment

问题描述

我试图在Python 3中使用正则表达式查找PHP源代码中的注释块。PHP注释格式如下：

I'm trying to find comment blocks in PHP source code using regular expressions in Python 3. The PHP comments are in this format:

/**
 * This is a very short block comment
 */

$ b b

现在我想出了以下正则表达式：

Now I came up with the following regular expression:

'/\*\*[.]+?\*/'

我认为 - 结合DOTALL标志 - 但不是。它没有找到什么。奇怪的是，当我删除尾部斜杠，像这样：

I figure that -in combination with the DOTALL flag- should do it, but no. It doesn't find anything. Strange thing is that when I remove the trailing slash, like this:

'/\*\*[.]+?\*'

那么它会找到以下字符串：

then it finds the following string:

/**\n\t*

$ b b

我不知道为什么正则表达式不能找到一个星号后面跟着一个斜线...我检查了文件，我正在搜索双检查我没有在打印错误的评论（我didn' t）。
正则表达式中的斜杠也不是特殊字符，所以我不必逃避它。 （我试过，但它没有帮助。）

I have no idea why the regex can't find an asterisk followed by a slash... I checked the file that I'm searching to double check I didn't have a typo in the comment (I didn't). Also a slash is no special character in regex, so I wouldn't have to escape it. (I tried, but it didn't help.)

任何人都可以告诉我我的正则表达式有什么问题？ ：）

Can anyone tell me what's wrong with my regex? :)

顺便说一句，我也遇到了这个！线程，有人试图在Java做同样的。最后的胜利答案完成了他的正则表达式与我现在做的一样，所以我很无能的:(这可能是一个Python正则表达式的错误或我完全错过了一些东西？

By the way, I also came across this! thread where someone tried to do the same in Java. The final winning answer finished his regular expression the same way I do now, so I'm clueless :( Could this be a bug in Python regex or am I completely missing something?

任何帮助是非常感谢！：D

Any help is much appreciated! :D

推荐答案

可以使用 re.DOTALL 。 c>。 c>。

You can use the re.DOTALL flag to make the . character match newlines:

re.compile(r'/\*\*.+?\*/', re.DOTALL)

b $ b

（注意，PHP块注释可以以 / * 开头，而不仅仅是 / ** 。）

(As a side note, PHP block comments can start with /*, not just /**.)

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