// ## External Dependencies
//@ This leaves us with just one more piece to complete rgrep: Taking arguments from the command-line. We could now directly work on
// ## External Dependencies
//@ This leaves us with just one more piece to complete rgrep: Taking arguments from the command-line. We could now directly work on
//@ a pretty boring lesson in string manipulation. Instead, I want to use this opportunity to show how easy it is to benefit from
//@ other people's work in your program.
//@
//@ a pretty boring lesson in string manipulation. Instead, I want to use this opportunity to show how easy it is to benefit from
//@ other people's work in your program.
//@
// the pattern to regular-expression mode, and change `filter_lines` to honor this option. The documentation of regex is available from its crates.io site.
// (You won't be able to use the `regex!` macro if you are on the stable or beta channel of Rust. But it wouldn't help for our use-case anyway.)
// the pattern to regular-expression mode, and change `filter_lines` to honor this option. The documentation of regex is available from its crates.io site.
// (You won't be able to use the `regex!` macro if you are on the stable or beta channel of Rust. But it wouldn't help for our use-case anyway.)