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The matcher

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What the playground opens with. Tasks and lessons set their own — a task that asked for `g` and then let you turn it off would be grading a different question from the one it asked.

Step budget in the playgroundA pattern that passes this is stopped and reported as over budget rather than left to run. Raising it is a real choice: a browser tab that stops responding is not a lesson about backtracking.Show flavour notesWhere PCRE, Python or Go would do something different from the ECMAScript flavour this engine implements. A pattern that works here and not there is worth knowing about before you paste it.Record a personal best on a taskOff makes an attempt unrecorded. Practising without a score on it is a legitimate thing to want, and this is what says so.

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