Question

我尝试使用跟随正则表达式：（a）？b（？（1）c | d）。这是http://www.regular-expressions.info/conditional.html的例子。

但我收到了错误。

/opt/logstash-1.4.2/bin/logstash -e 'input { stdin { } }  filter { grok { match => [ "message", "(a)?b(?(1)c|d)" ] } } output { stdout { codec => rubydebug }}'
+---------------------------------------------------------+
| An unexpected error occurred. This is probably a bug.   |
| You can find help with this problem in a few places:    |
|                                                         |
| * chat: #logstash IRC channel on freenode irc.          |
|     IRC via the web: http://goo.gl/TI4Ro                |
| * email: logstash-users@googlegroups.com                |
| * bug system: https://logstash.jira.com/                |
|                                                         |
+---------------------------------------------------------+
The error reported is: 
  undefined group option: /(a)?b(?(1)c|d)/

Answer 1

Logstash使用Oniguruma Regular Expressions。他们的文档说这是一个＆＃34;缺乏功能与perl 5.8.0＆＃34;相比。所以，没有。

logstash是否支持正则表达式中的If-Then-Else条件？

1 个答案: