This question requires 5 other plugins to work. If you want easy install, download full archive from our BitBucket site. You could unpack it into Moodle core folder (the one with config.php) and it will place anything where it belongs.
If you want to fully use Authoring Tools, you should also have Open Source Graphviz packet installed and path to it specified into Moodle. It is necessary to draw Syntax Tree and Explaining Graph.
Oleg Sychev (Lead maintainer): Idea, design, question type and behaviours code, hinting, error reporting, regular expression testing (authoring tool)
Valeriy Streltsov: Regex parsing, NFA regex matching engine, matchers testing, backup&restore, unicode support, selection in regex text (in authoring tools)
Dmitry Pahomov: Regex description (authoring tool)
Vladimir Ivanov: Explaining graph (authoring tool)
Grigory Terekhov: Syntax tree (authoring tool)
Elena Lepilkina: Assertions support
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