jacarex is a fast command-line tool for testing regular expressions interactively.
It also features a small tutorial for regex learning.

You need the Rust compiler to build jacarex. Get it at rustup.rs

Jacarex is being developed with the current rustc v1.50 version, but should be buildable on other recent versions as well.

git clone https://github.com/vrmiguel/jacarex   # clone the repo
cargo install --path jacarex                    # Install it

jacarex usage is based on subcommands (similar to git).

The subcommands available are playground and tutorial.

Simple regex tester and tutorial

USAGE:
    jacarex [SUBCOMMAND]

FLAGS:
    -h, --help       Displays this message and exits
    -V, --version    Prints version information

SUBCOMMANDS:
    help          Prints this message or the help of the given subcommand(s)
    playground    Enters the Regex testing REPL.
    tutorial      Starts a set of guided interactive lessons on Regex matching.

Opens up a REPL where you can test a pattern against multiple text samples.

jacarex-playground 
Enters the Regex testing REPL.

USAGE:
    jacarex playground [OPTIONS]

OPTIONS:
    -f, --filename <filename>    Loads the file passed as argument as a test string
    -w, --words <words>...       Loads the words passed as arguments as test strings

Note: tester is an alias to playground, so `jacarex tester` works as well.

The tutorial subcommand starts a series of interactive guided lessons on regex matching.

jacarex-tutorial 
Starts a set of guided interactive lessons on Regex matching.

USAGE:
    jacarex tutorial [OPTIONS]

OPTIONS:
    -l, --lesson <lesson>    Sets the lesson to be loaded

1. jacarex uses the excellent regex crate, and therefore inherits its advantages, such as great performance, as well as its quirks (no backtracking, no look around, no UTF-16 support).

2. jacarex relies on terminal colors to highlight matches (or lack thereof). A no-colors feature is planned but not currently implemented.

Any contributions are welcome!

Specially in making new lesson for the tutorial

Please file bugs on the Issues page