Question

I have a file lets say it is called

                                 filename.c

I am trying to find if the file is being used in one of the following ways

                          1.  include("filename.c");
                          2.   require("filename.c");
                          3.   x = new filename() ; 
                          4.   class new_class extends filename
                          5.   class new_class implements filename
                          6.   filename::function()

I am wondering if perl will allow me to do all the above search at once or I just have to do them one by one?

And also I am not very good at regular expressions so I am wondering how can I grep the string
extends filename
implement filename

the space in between is giving me problems. Thanks in advance.

Answer 1

what is wrong with grep?

W="filename"
find . -type f -print0 | xargs -0 grep -ilP "include(\"$W\.c\")|require(\"$W\.c\")|x\s*=\s*new\s+$W()|class\s+new_class\s+extends\s+$W|class\s+new_class\s+implements\s+$W|$W::function()"