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我試圖使用follow正則表達式：（a）？b（？（1）c | d）。例如從http://www.regular-expressions.info/conditional.html。Logstash是否支持正則表達式中的If-Then-Else條件？
但我得到錯誤。
/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: [email protected] |
| * bug system: https://logstash.jira.com/ |
| |
+---------------------------------------------------------+
The error reported is:
undefined group option: /(a)?b(?(1)c|d)/