macos 为什么这个正则表达式不起作用： find ./ -regex '.*\(m\|h\)$
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why isn't this regex working : find ./ -regex '.*\(m\|h\)$
提问by Greg
Why isn't this regex working?
为什么这个正则表达式不起作用？
find ./ -regex '.*\(m\|h\)$
I noticed that the following works fine:
我注意到以下工作正常：
find ./ -regex '.*\(m\)$'
But when I add the "or a h at the end of the filename" by adding \|hit doesn't work. That is, it should pick up all my *.mand *.hfiles, but I am getting nothing back.
但是当我在文件名末尾添加“或啊”时，\|h它不起作用。也就是说，它应该拿起我所有的*.m和*.h文件，但我得到任何回报。
I am on Mac OS X.
我在 Mac OS X 上。
回答by Mikel
On Mac OS X, you can't use \|in a basic regular expression, which is what finduses by default.
在 Mac OS X 上，您不能\|在基本正则表达式中使用，这是find默认使用的。
[basic] regular expressions differ in several respects. | is an ordinary character and there is no equivalent for its functionality.
[基本] 正则表达式在几个方面有所不同。| 是一个普通字符，它的功能没有等价物。
The easiest fix in this case is to change \(m\|h\)to [mh], e.g.
在这种情况下最简单的解决方法是更改\(m\|h\)为[mh]，例如
find ./ -regex '.*[mh]$'
Or you could add the -Eoption to tell find to use extended regular expressions instead.
或者您可以添加-E选项来告诉 find 使用扩展的正则表达式。
find -E ./ -regex '.*(m|h)$'
Unfortunately -Eisn't portable.
不幸的-E是不便携。
Also note that if you only want to list files ending in .mor .h, you have to escape the dot, e.g.
另请注意，如果您只想列出以.mor结尾的文件.h，则必须对点进行转义，例如
find ./ -regex '.*\.[mh]$'
If you find this confusing (me too), there's a great reference table that shows which features are supported on which systems.
如果您觉得这令人困惑（我也是），这里有一个很好的参考表，其中显示了哪些系统支持哪些功能。
回答by Wes
A more efficient solution is to use the -oflag:
更有效的解决方案是使用-o标志：
find . -type f \( -name "*.m" -o -name "*.h" \)
but if you want the regex use:
但如果你想要正则表达式使用：
find . -type f -regex ".*\.[mh]$"
回答by IDBUYTHATFORADOLLAR
Okay this is a little hacky but if you don't want to wrangle the regex limitations of find on OSX, you can just pipe find's output to grep:
好的，这有点 hacky 但如果您不想在 OSX 上纠结 find 的正则表达式限制，您可以将 find 的输出通过管道传递给 grep：
find . | grep ".*\(\h\|m\)"
回答by tchrist
What's wrong with
怎么了
find . -name '*.[mh]' -type f
If you want fancy patterns, then use find2perland hack the pattern.
如果你想要花哨的模式，那么使用find2perl并破解模式。
