# How to Grok a pattern into multiple field names

**URL:** <https://discuss.elastic.co/t/how-to-grok-a-pattern-into-multiple-field-names/201300>\
**Category:** Kibana\
**Created:** [September 26, 2019, 6:58pm UTC](https://discuss.elastic.co/t/how-to-grok-a-pattern-into-multiple-field-names/201300 "2019-09-26T18:58:04Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![kmiklas](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kmiklas/32/50730_2.png) [@kmiklas](https://discuss.elastic.co/u/kmiklas)\
**Post date:** [September 26, 2019, 6:58pm UTC](https://discuss.elastic.co/t/how-to-grok-a-pattern-into-multiple-field-names/201300/1 "2019-09-26T18:58:04Z")

</div>

How can I grok a matched pattern into multiple field names?

Is it possible to parse and assign a matched pattern twice with Grok?

**Minimal, Complete, Verifiable Example**

Take this log line:

> 09/26/2019 Keith Miklas

Apply this grok filter:

```
%{DATE:date}\s*%{WORD:first_name}\s*%{WORD:last_name}

```

This yields:

```
{
  "date": [
    [
      "09/26/2019"
    ]
  ],
  "first_name": [
    [
      "Keith"
    ]
  ],
  "last_name": [
    [
      "Miklas"
    ]
  ]
}

```

What I need is a grok filter something like this:

```
%{DATE:date}\s*%{WORD:first_name,fn}\s*%{WORD:last_name,ln}
%{DATE:date}\s*%{WORD:first_name&fn}\s*%{WORD:last_name&ln}
%{DATE:date}\s*%{WORD:first_name|fn}\s*%{WORD:last_name|ln}

```

Yielding this:

```
{
  "date": [
    [
      "09/26/2019"
    ]
  ],
  "first_name": [
    [
      "Keith"
    ]
  ],
  "fn": [
    [
      "Keith"
    ]
  ],
  "last_name": [
    [
      "Miklas"
    ]
  ],
  "ln": [
    [
      "Miklas"
    ]
  ]
}

```

---

<div class="post-metadata">

**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [September 27, 2019, 6:15am UTC](https://discuss.elastic.co/t/how-to-grok-a-pattern-into-multiple-field-names/201300/2 "2019-09-27T06:15:07Z")

</div>

You can not do that as far as I know, but you could copy the fields separately afterwards.

---

<div class="post-metadata">

**Author:** ![kmiklas](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kmiklas/32/50730_2.png) [@kmiklas](https://discuss.elastic.co/u/kmiklas)\
**Post date:** [September 30, 2019, 5:44pm UTC](https://discuss.elastic.co/t/how-to-grok-a-pattern-into-multiple-field-names/201300/3 "2019-09-30T17:44:38Z")

</div>

> <https://stackoverflow.com/questions/58123123/how-to-grok-a-pattern-into-multiple-field-names/58123343#58123343>

---

<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:** [October 28, 2019, 5:44pm UTC](https://discuss.elastic.co/t/how-to-grok-a-pattern-into-multiple-field-names/201300/4 "2019-10-28T17:44:54Z")

</div>

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