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// Parse a log line const log = "2024-06-15 10:30:00 [ERROR] Connection refused"; const regex = /(?<date>\d{4}-\d{2}-\d{2}) (?<time>\d{2}:\d{2}:\d{2}) \[(?<level>\w+)\] (?<message>.+)/; const { groups } = log.match(regex); console.log(groups.date); // "2024-06-15" console.log(groups.level); // "ERROR" console.log(groups.message); // "Connection refused" // Use named groups in replacement "2024-06-15".replace(/(?<y>\d{4})-(?<m>\d{2})-(?<d>\d{2})/, "$<d>/$<m>/$<y>"); // "15/06/2024"
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