Why isn't this regex working?
find ./ -regex '.*\(m\|h\)$
I noticed that the following works fine:
find ./ -regex '.*\(m\)$'
But when I add the "or ah at the end of the filename" by adding \\|h
it doesn't work. That is, it should pick up all my *.m
and *.h
files, but I am getting nothing back.
I am on Mac OS X.
On Mac OS X, you can't use \\|
in a basic regular expression, which is what find
uses by default.
[basic] regular expressions differ in several respects. | is an ordinary character and there is no equivalent for its functionality.
The easiest fix in this case is to change \\(m\\|h\\)
to [mh]
, eg
find ./ -regex '.*[mh]$'
Or you could add the -E
option to tell find to use extended regular expressions instead.
find -E ./ -regex '.*(m|h)$'
Unfortunately -E
isn't portable.
Also note that if you only want to list files ending in .m
or .h
, you have to escape the dot, eg
find ./ -regex '.*\.[mh]$'
If you find this confusing (me too), there's a great reference table that shows which features are supported on which systems.
A more efficient solution is to use the -o
flag:
find . -type f \( -name "*.m" -o -name "*.h" \)
but if you want the regex use:
find . -type f -regex ".*\.[mh]$"
好吧这有点hacky但是如果你不想在OSX上争论find的正则表达式限制,你可以将find的输出管道输出到grep:
find . | grep ".*\(\h\|m\)"
What's wrong with
find . -name '*.[mh]' -type f
If you want fancy patterns, then use find2perl and hack the pattern.
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