logstash - 获取 grok 过滤器转换为的正则表达式？

Question

我有一个复杂的 grok 过滤器表达式...是否有可能获得此过滤器转换成的正则表达式？

Answer 1

您可以使用一个简单的 Perl 脚本来完成它，该脚本读取模式文件并将 %{PATTERN} 内容替换为它所基于的实际正则表达式——您必须稍微自定义一下, 但它显示了如何做:

#!/usr/bin/perl

# this is the path to your grok-patterns file
open(F,"patterns/grok-patterns");
while (<F>) {
  chomp;
  if (/^(\S+) (.*)/) {
    $pattern{$1} = $2;
  }
}
close(F);

# this is the grok pattern I want to expand
$pattern='%{IP:junk} %{COMBINEDAPACHELOG:junk2}';

while ($pattern =~ /(%\{([^:\}]+):?[^\}]*\})/) {
    $name = $2;
    substr($pattern,$-[0],$+[0]) = $pattern{$name};
}
print $pattern,"\n";