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RegExp
Learn RegExp in ActionScript 3 with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.
RegExp is an atomic ActionScript 3 topic inside Runtime & Utilities. The example below uses the actual construct named by the lesson rather than a generic placeholder.
Focus on what RegExp changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.
Topic-specific example
var re:RegExp=/^[A-Z]{2}-\d{3}$/; trace(re.test("AB-123"));
Test boundary input such as empty text, unexpected encoding, or malformed structured data so parsing assumptions are explicit.