logstash grok 内置正则 https://github.com/elastic/logstash/blob/v1.4.2/patterns/grok-patterns USERNAME [a-zA-Z0-._-]+ USER %{USERNAME} INT (?:[+-]?(?:[-]+)) BASE10NUM (?<![-.+-])(?>[+-]?(?:(?:[-]+(?:\.[-]+)?)|(?:\.[-]+))) NUMBER (?:%{BASE10NUM}) BASE16N…