Gmail – Search in Gmail – How to search the mails without reply

I'm afraid you can't. Looking at Gmail help, there's nothing related to searching within attachments.

You can specify a file name, but that's it:

filename:physicshomework.txt

Or you could save files you want to search through to Google Docs.

The simple explanation why it's not possible is that it would require a tremendous amount of indexing to be done. Gmail search isn't that fast to begin with, and I can imagine it'd take far too long to search within attachments.

Also note that this is a feature that even most desktop clients don't do.

That being said, there seems to be a startup that focuses on what you want: attachments.me

Attachments.me indexes your email account and presents an attachments-centric view of it. We create thumbnails, let you search within attachments, and, above all, make your email better

Even though the two halves (From:...) and (To:...) are enclosed in parenthesis, I think you will get more accurate results if you prefix both addresses in each half with the From: or To: accordingly(see below). As it is now, I think it is searching for the second email address of each half anywhere in any message.

Example:

(From: johndoe@gmail.com OR From: johndoe@outlook.com) AND (To: johndoe@gmail.com OR To: johndoe@outlook.com)