Regular expression to extract header name from c f

问题:

How to extract headers from a c file that contains them like this?

#include <tema4header9.h>
#include    <tema4header3.h>
#include   <stdio.h>
#include        <longnametest/newheader.h>
#include <net/header.h>
#include  "last-test-Zhy3/DrRuheader.h"
#include <last-test-8fF7/a5xyheader.h>

I tried to use:

sed -n -e 's/#include[ \t]*[<"]\([^ \/<"]*\/[^ \/]*\)\.h[">]/\1\.h/p'

but it only works for those in subdirectories. also if i type:

sed -n -e 's/#include[ \t]*[<"]\(([^ \/<"]*\/)+[^ \/]*\)\.h[">]/\1\.h/p'

or

sed -n -e 's/#include[ \t]*[<"]\(([^ \/<"]*\/)*[^ \/]*\)\.h[">]/\1\.h/p'

the command does not work anymore. The output file should look like this:

tema4header9.h
tema4header3.
stdio.h
longnametest/newheader.h
net/header.h
last-test-Zhy3/DrRuheader.h
last-test-8fF7/a5xyheader.h

回答1:

grep solution: This is using perl regex and printing anything between "<" or '"' on the lines which start with #include.

grep -oP '^#include.*(<|")\K.*(?=>|")' headers
tema4header9.h
tema4header3.h
stdio.h
longnametest/newheader.h
net/header.h
last-test-Zhy3/DrRuheader.h
last-test-8fF7/a5xyheader.h

If you are ok with awk:

awk '/#include/{gsub(/<|>|"/,"",$2);print $2}' headers
tema4header9.h
tema4header3.h
stdio.h
longnametest/newheader.h
net/header.h
last-test-Zhy3/DrRuheader.h
last-test-8fF7/a5xyheader.h

回答2:

This should work:

sed -nr 's/#include\s+[<"]([^>"]+)[>"].*/\1/p'

回答3:

Try:

awk '{match($0,/[<"].*[>"]/);print substr($0,RSTART+1,RLENGTH-2)}' Input_file