xzgrep and other Compressed Pattern Matching Tools

2018-06-23 10:21:15

I'm experimenting on compressed pattern matching utilities, or more specifically searching for text patterns within LZW-compressed text files.

I'm wondering if the xzgrep Linux utility is applying a certain algorithm for achieving that, or is it just equivalent to the regular decompression and grepping, and has nothing to do eg

uncompress LARGE_TEXT_FILE.Z | grep "My Pattern"

Also, are there any other utilities/software that apply any compressed pattern-matching algorithms (LZW-compressed text files, like http://tandem.bu.edu/papers/let.sleeping.files.lie.jcss.1996.pdf) , preferably with the source code available?

Thank you!

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