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rga: ripgrep, but also search in PDFs, E-Books, Office documents, etc.
rga is a line-oriented search tool that allows you to look for a regex in a multitude of file types. rga wraps the awesome ripgrep and enables it to search in PDF, docx, sqlite, JPG, movie subtitles (mkv, mp4), etc.
CRGREP searches for matching text in databases, various document formats, archives and other difficult to access resources.
A command line tool for name and content text matching in database tables, plain files, MS Office documents, PDF, archives, MP3 audio, image meta-data, scanned documents, maven dependencies and web resources.
CRGREP will search resources within resources of any arbitrary combination or depth, so text within a document within a zip archive, and so on.
Here you will find binary downloads and discussion (https://sourceforge.net/p/crgrep/discussion/) . ...
An open source search engine with RESTFul API and crawlers
...Using the web user interface, the crawlers (web, file, database, etc.) and the client libraries (REST/API , Ruby, Rails, Node.js, PHP, Perl) you will be able to integrate quickly and easily advanced full-text search capabilities in your application: Full-text with basic semantic, join queries, boolean queries, facet and filter, document (PDF, Office, etc.) indexation, web scrapping,etc. OpenSearchServer runs on Windows and Linux/Unix/BSD.