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This regex is designed to extract ejection fraction measurements (like "LVEF" or "ejection fraction") from clinical text or medical notes. It looks for common abbreviations or full phrases, followed by optional separators and comparison operators, to capture a two-digit numerical value, optionally allowing for ranges (e.g., 55-60) and a percentage sign. It is particularly useful in natural language processing of electronic health records (EHR) for cardiology data extraction.