# Grok - Value could appear or not. multiple rules? **URL:** \ **Category:** Logstash\ **Created:** [May 20, 2021, 2:01pm UTC](https://discuss.elastic.co/t/grok-value-could-appear-or-not-multiple-rules/273548 "2021-05-20T14:01:26Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![legolas\_bilbao](https://avatars.discourse-cdn.com/v4/letter/l/3da27b/32.png) [@legolas\_bilbao](https://discuss.elastic.co/u/legolas_bilbao)\ **Post date:** [May 20, 2021, 2:01pm UTC](https://discuss.elastic.co/t/grok-value-could-appear-or-not-multiple-rules/273548/1 "2021-05-20T14:01:26Z")
I'm working with some logs from squid but one value could appear or not 1621232309.575 1 172.99.6.74 TCP\_MEM\_HIT/206 3096 GET [http://storage.googleapis.com/](http://storage.googleapis.com/) - HIER\_NONE/- application/octet-stream 1621232309.575 1 172.99.6.74 TCP\_MEM\_HIT/206 3096 GET [http://storage.googleapis.com/](http://storage.googleapis.com/) - HIER\_NONE/1.1.1.1- application/octet-stream How can i manage through grok the differences?? ---
**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\ **Post date:** [May 20, 2021, 3:22pm UTC](https://discuss.elastic.co/t/grok-value-could-appear-or-not-multiple-rules/273548/2 "2021-05-20T15:22:18Z")
You can surround part of the grok pattern with ( and )? so that it matches zero or more times. ---
**Author:** ![legolas\_bilbao](https://avatars.discourse-cdn.com/v4/letter/l/3da27b/32.png) [@legolas\_bilbao](https://discuss.elastic.co/u/legolas_bilbao)\ **Post date:** [May 21, 2021, 12:45pm UTC](https://discuss.elastic.co/t/grok-value-could-appear-or-not-multiple-rules/273548/3 "2021-05-21T12:45:16Z")
many thanks!! ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [June 18, 2021, 12:45pm UTC](https://discuss.elastic.co/t/grok-value-could-appear-or-not-multiple-rules/273548/4 "2021-06-18T12:45:48Z")
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