Name the engine because syntax and backtracking behaviour differ between JavaScript, Python, PHP, Java and .NET.
Prompt
MetaCyberGuru reviewed
Evaluate this regular expression as production input validation. Explain what it accepts, then design positive, negative and adversarial test cases. Include empty input, Unicode, extreme length, ambiguous boundaries and likely ReDoS cases. Do not claim the expression is safe unless the evidence supports it. Regex: [REGEX]. Intended rule: [RULE]. Engine: [ENGINE].
What to customize
REGEX
RULE
ENGINE
Expected output
A behaviour explanation, a runnable test matrix and a clear performance-risk assessment.
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