# Streams regular expression on timestamp **URL:** \ **Category:** Graylog Central (peer support)\ **Created:** [May 16, 2019, 1:07pm UTC](https://community.graylog.org/t/streams-regular-expression-on-timestamp/10463 "2019-05-16T13:07:48Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![GuillaumeDB](https://avatars.discourse-cdn.com/v4/letter/g/9fc29f/32.png) [@GuillaumeDB](https://community.graylog.org/u/GuillaumeDB)\ **Post date:** [May 16, 2019, 1:07pm UTC](https://community.graylog.org/t/streams-regular-expression-on-timestamp/10463/1 "2019-05-16T13:07:48Z")
Hello, I already post on the forum last months because I started with Graylog. Thanks to some of people here I succeeded to set up an infrastrucutre that my company (for few months because i’m in traineeship) use. I will make a presentation soon of what I did but I would like to show a little more things such as regular expression that we can use. But I never used regex before. But I really want to set up one in a stream to stand out messages of the night when doors of the company are closed. ![regex](https://us1.discourse-cdn.com/flex016/uploads/graylog/original/2X/a/a776b632d7be5b8c387753d14a363fc9caf43689.png) I want to take the field “timestamp” and say that for any date i will just take hour values (here “12:35:54”) but just keep messages where hour display is between 18:00:00 and 09:00:00. Is it possible with regular expression ? I guess yes and if someone can lead me it will be great Thanks a lot ---
**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/graylog/original/3X/c/7/c7c09c6b5099570133d6502b83f50ba4430de5b6.png) [@system](https://community.graylog.org/u/system)\ **Post date:** [May 30, 2019, 1:07pm UTC](https://community.graylog.org/t/streams-regular-expression-on-timestamp/10463/2 "2019-05-30T13:07:49Z")
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