# LUCENE regexp sintax not working **URL:** \ **Category:** Kibana\ **Created:** [October 28, 2019, 12:19pm UTC](https://discuss.elastic.co/t/lucene-regexp-sintax-not-working/205456 "2019-10-28T12:19:52Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Ernesto\_Porro](https://avatars.discourse-cdn.com/v4/letter/e/35a633/32.png) [@Ernesto\_Porro](https://discuss.elastic.co/u/Ernesto_Porro)\ **Post date:** [October 28, 2019, 12:19pm UTC](https://discuss.elastic.co/t/lucene-regexp-sintax-not-working/205456/1 "2019-10-28T12:19:52Z")
Hey guys, recently i provisioned a kubernetes cluster of ES, and Kibana with anothers tools, like filebeat, etc. The problem is with Lucene Search sintax on Kibana Search bar, in a testing install, this sintax: "agent.hostname: /app10[3,4,6,7,8]/" works wheel and match agent.hostanames: app103,app104,app106,... etc, but in production not work this sintax, the KQL is disabled on the search bar, and nothing show when i use the querie. Any body can help me with this? Thanks, in advance.. sorry for my bad english. ---
**Author:** ![Marius\_Dragomir](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/marius_dragomir/32/42087_2.png) [@Marius\_Dragomir](https://discuss.elastic.co/u/Marius_Dragomir)\ **Post date:** [November 18, 2019, 2:54pm UTC](https://discuss.elastic.co/t/lucene-regexp-sintax-not-working/205456/2 "2019-11-18T14:54:09Z")
You can check in advanced settings to see what is the default language used for the search bar. Also it will depend on the version of kibana, as KQL is a recent-ish addition to Kibana. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [December 16, 2019, 2:54pm UTC](https://discuss.elastic.co/t/lucene-regexp-sintax-not-working/205456/3 "2019-12-16T14:54:15Z")
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