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I have found a command M-x project-find-regexp, how can I find out from where it comes from, ELPA/Melpa package or part of GNU/Emacs?

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    describe-function gives you a link to the corresponding file. – bertfred Aug 22 '17 at 8:54
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Use describe-function to get information about a function: C-h f project-find-regexp RET (or F1 f project-find-regexp RET). The first line is something like

project-find-regexp is a compiled Lisp function in `project.el'.

Click on the file name, or move the cursor to it and press RET. If you have the source code, this opens the file containing the function definition. Now press C-h f (find-file); this comes pre-filled with the path to the directory containing the file. Press C-g to cancel. (Alternative ways to find the directory include M-x pwd RET; this makes it harder to copy-paste from.)

From the directory path, you should be able to tell whether it's part of Emacs (e.g. under /usr/share/emacs/VERSION/lisp on a typical Linux system), a third-party file installed either through an OS-level package or manually (under a directory called site-lisp), or through Emacs's ELPA package mechanism (under .emacs.d/elpa in your home directory).

If you don't have the source code of the file that defines the function, you'll only get something like

project-find-regexp is an interactive compiled Lisp function.

In this case, you can run M-: (find-function 'project-find-regexp). You'll get an error message with the location where Emacs expects to find the source file. Press ESC ESC ESC to dismiss the error message.

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