# Regex based query in elasticsearch 5.6 **URL:** \ **Category:** Elasticsearch\ **Created:** [April 28, 2019, 2:27pm UTC](https://discuss.elastic.co/t/regex-based-query-in-elasticsearch-5-6/178803 "2019-04-28T14:27:30Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Umang\_Mishra](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/umang_mishra/32/45180_2.png) [@Umang\_Mishra](https://discuss.elastic.co/u/Umang_Mishra)\ **Post date:** [April 28, 2019, 2:27pm UTC](https://discuss.elastic.co/t/regex-based-query-in-elasticsearch-5-6/178803/1 "2019-04-28T14:27:30Z")
In elasticsearch 5.6, for getting the data, I am using values as regex in the query. The query is working for only lowercase regex values, even a single uppercase letter disqualifies the query. For Example \_search?q=rv11:/._reader._/ --\> working fine, but \_search?q=rv11:/._Reader._/ or \_search?q=rv11:/._READER._/ --\> are not working Please suggest me something. ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [April 28, 2019, 4:16pm UTC](https://discuss.elastic.co/t/regex-based-query-in-elasticsearch-5-6/178803/2 "2019-04-28T16:16:42Z")
Wildcard queries are not analyzed. And you should not be using those are they can be very slow. ---
**Author:** ![Umang\_Mishra](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/umang_mishra/32/45180_2.png) [@Umang\_Mishra](https://discuss.elastic.co/u/Umang_Mishra)\ **Post date:** [April 28, 2019, 5:02pm UTC](https://discuss.elastic.co/t/regex-based-query-in-elasticsearch-5-6/178803/3 "2019-04-28T17:02:57Z")
Hi David I acknowledge that one should not be using such queries. But having said that, Is there any way to perform case-insensitive wildcard queries ? ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [April 28, 2019, 5:50pm UTC](https://discuss.elastic.co/t/regex-based-query-in-elasticsearch-5-6/178803/4 "2019-04-28T17:50:59Z")
I think you can define an analyzer in the query string query. [https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html) ---
**Author:** ![Umang\_Mishra](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/umang_mishra/32/45180_2.png) [@Umang\_Mishra](https://discuss.elastic.co/u/Umang_Mishra)\ **Post date:** [April 29, 2019, 4:59am UTC](https://discuss.elastic.co/t/regex-based-query-in-elasticsearch-5-6/178803/5 "2019-04-29T04:59:00Z")
Elasticsearch 7.0 does analyze the wildcard queries and performs the regex-based, case-insensitive search operations. What's your take on that ? ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [May 3, 2019, 12:55pm UTC](https://discuss.elastic.co/t/regex-based-query-in-elasticsearch-5-6/178803/6 "2019-05-03T12:55:31Z")
In the documentation I linked to there is an `analyze_wildcard` option. It says: > By default, wildcards terms in a query string are not analyzed. By setting this value to `true` , a best effort will be made to analyze those as well. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [May 31, 2019, 12:55pm UTC](https://discuss.elastic.co/t/regex-based-query-in-elasticsearch-5-6/178803/7 "2019-05-31T12:55:34Z")
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