# How to match backspace in grok filter?

**URL:** <https://discuss.elastic.co/t/how-to-match-backspace-in-grok-filter/135326>\
**Category:** Logstash\
**Created:** [June 11, 2018, 9:48am UTC](https://discuss.elastic.co/t/how-to-match-backspace-in-grok-filter/135326 "2018-06-11T09:48:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![RameshNagargoje](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rameshnagargoje/32/30212_2.png) [@RameshNagargoje](https://discuss.elastic.co/u/RameshNagargoje)\
**Post date:** [June 11, 2018, 9:48am UTC](https://discuss.elastic.co/t/how-to-match-backspace-in-grok-filter/135326/1 "2018-06-11T09:48:44Z")

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input: (NvCapture) Error

Tried grok : (?/(NvCapture/) Error)

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 9, 2018, 9:48am UTC](https://discuss.elastic.co/t/how-to-match-backspace-in-grok-filter/135326/2 "2018-07-09T09:48:46Z")

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Closed on July 9, 2018, 9:48am UTC

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