Quantifiers

[UdeshyaDhungana]

• Purposefully left out lazy quantifiers because this extension, as any other grep extension, despite their short explanation, involve a lot of logic during implementation.

Greedy quantifiers can be a separate extension idea.

Included {{#reader_is_bot}} section, because saw it in back-references stage description.

[rohitpaulk]

Breakdown looks good! Once @TropicolX is done with the Redis challenge he'll help out with the stage names and instructions here - should be ready around the time we're going to ship 🙂