Simple implementation of grep written in Rust. Based on the tutorial chapter in the excellent Rust Programming Book.
$ git clone https://github.com/jonathanGB/rust-grep.git
$ cd rust-grep
$ cargo run <query> <filename> [--case_insensitive]
where query is the keyword you are grepping inside a file which path is filename. It is possible to denote a case insensitive search by using the --case_insensitive flag. Minigrep is also currently limited in that we can only grep one file.
$ cargo run are poem.txt
Line 1: I'm nobody! Who are you?
$ cargo run are poem.txt --case_insensitive
Line 1: I'm nobody! Who are you?
Line 2: Are you nobody, too?
$ cargo run '\b[a-z]{3}re' poem.txt
Line 3: Then there's a pair of us - don't tell!