[2018-11-06T10:47:46,868][ERROR][logstash.pipeline ] Pipeline aborted due to error {:pipeline_id=>"main", :exception=>#<RegexpError: undefined group option: //var/log/.?/(?.?)//m>, :backtrace=>["org/jruby/RubyRegexp.java:928:in initialize'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/jls-grok-0.11.5/lib/grok-pure.rb:127:incompile'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-grok-4.0.3/lib/logstash/filters/grok.rb:281:in block in register'", "org/jruby/RubyArray.java:1734:ineach'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-grok-4.0.3/lib/logstash/filters/grok.rb:275:in block in register'", "org/jruby/RubyHash.java:1343:ineach'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-filter-grok-4.0.3/lib/logstash/filters/grok.rb:270:in register'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:241:inregister_plugin'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:252:in block in register_plugins'", "org/jruby/RubyArray.java:1734:ineach'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:252:in register_plugins'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:594:inmaybe_setup_out_plugins'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:262:in start_workers'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:199:inrun'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:159:in `block in start'"], :thread=>"#<Thread:0x2d1a4dc1 run>"}
[2018-11-06T10:47:46,890][ERROR][logstash.agent ] Failed to execute action {:id=>:main, :action_type=>LogStash::ConvergeResult::FailedAction, :message=>"Could not execute action: PipelineAction::Create<main>, action_result: false", :backtrace=>nil}
getting below error after adding