正则表达式匹配＃ [英] Regular expression to match a #

问题描述

我正在尝试使用正则表达式来匹配包含＃

的字符串（基本上我正在寻找#include ...）


我似乎无法写出与之匹配的正则表达式。


我的（可能天真）方法是：p = re.compile（r''\ #include\b）

我也试过p = re.compile（r''\\＃ include \ b）徒劳地试图在＃

之前使用

a反斜杠作为转义字符以上所有都没有返回匹配像#include<这样的字符串; stdio>" ;.


我知道＃用于评论，因此我试图逃避它...


任何建议关于如何获得正则表达式来找到＃？


谢谢

Hi,

I''m trying to use a regular expression to match a string containing a #
(basically i''m looking for #include ...)

I don''t seem to manage to write a regular expression that matches this.

My (probably to naive) approach is: p = re.compile(r''\b#include\b)
I also tried p = re.compile(r''\b\#include\b) in a futile attempt to use
a backslash as escape character before the #
None of the above return a match for a string like "#include <stdio>".

I know a # is used for comments, hence my attempt to escape it...

Any suggestion on how to get a regular expression to find a #?

Thanks

推荐答案

>我的（可能是天真的）方法是：p = re.compile（r''\ ## include \b）


我认为你的问题是\b在开始。 \b匹配单词中断

（定义为\w\W或\ W\w）。如果前面的字符是\w（即[A-Za-z0-9_]，也许是
$ b $），那么在＃

之前只会有一个单词中断b一些其他字符，具体取决于您的语言环境）。


但是，在include之后的\b正是你想要的。


-

我已经选择了婴儿房间的主题并做了其他的

东西。我决定让Jon有这个。

- Jamie Cusack（荷兰人），她的丈夫Jon

终于和她谈了让他给他们的儿子命名为Jon 2.0

> My (probably to naive) approach is: p = re.compile(r''\b#include\b)

I think your problem is the \b at the beginning. \b matches a word break
(defined as \w\W or \W\w). There would only be a word break before the #
if the preceding character were a \w (that is, [A-Za-z0-9_], and maybe
some other characters depending on your locale).

However, the \b after the "include" is exactly what you want.

--
I had picked out the theme of the baby''s room and done other
things. I decided to let Jon have this.
- Jamie Cusack (of the Netherlands), whose husband Jon
finally talked her into letting him name their son Jon 2.0

谢谢，

这就行了......

Thanks,
That did the trick...

Dan写道：

Dan wrote:

我的（可能是天真的）方法是：p = re.compile（r''\ b #include\b）

My (probably to naive) approach is: p = re.compile(r''\b#include\b)

我认为你的问题是开头的\b。 \b匹配单词分隔
（定义为\w\W或\ W\w）。如果前面的字符是\w（即[A-Za-z0-9_]，可能还有其他字符取决于你的语言环境，那么＃
之前只会有一个单词分隔符但是，

然后，在包括之后的\b正是你想要的。

I think your problem is the \b at the beginning. \b matches a word break
(defined as \w\W or \W\w). There would only be a word break before the #
if the preceding character were a \w (that is, [A-Za-z0-9_], and maybe
some other characters depending on your locale).

However, the \b after the "include" is exactly what you want.

所以OP可能想要''\ B''与''\ b''完全相反的开头

字符串，即仅匹配＃，如果它没有字母开头。


或者C风格#includes搜索r''^ \ s *＃\ * * include \ b''。

So the OP probably wanted ''\B'' the exact opposite of ''\b'' for the start of
the string, i.e. only match the # if it is NOT preceded by a wordbreak.

Alternatively for C style #includes search for r''^\s*#\s*include\b''.

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