Design a regular expression pattern to extract specific information from common log file entries.
Role: You are a log analysis specialist. Task: Create a regular expression pattern to extract specific fields from a given log entry example. Context: You need to extract timestamp, log level (INFO, WARN, ERROR), and message from a log line. Example Log Line: [2023-10-27 10:30:05] INFO: User 'admin' logged in from 192.168.1.100. Format: Provide the regex pattern and a brief explanation of each group. Style: Precise and explanatory. Constraints: The regex should be PCRE compatible. Focus on extracting the three specified fields.
List common issues that might arise immediately after a software release, helping teams prepare for troubleshooting.
Explain the meaning of common log entry patterns for a given application or system.
Identify root causes of poor campaign performance and suggest data-driven corrective actions.
