app to search within text file-and other requirements iPhone

My use case is this: I have over 3,000 books on my ipad. I want to have a list of those books (I can create the list easily as a txt file) on my iPhone with an easy way to search. (the format of the file name is title-author.epub) eg: I can get the list on evernote, but cant search within an evernote note. I want to be able to simply email the txt file to my gmail account and be able to search for specific character string in that attachment from the iPhone. I dont want to have to have a wifi connection or load it through itunes.
Any suggestions?
iPhone 3g iOS 4