# Nested grok

**URL:** <https://discuss.elastic.co/t/nested-grok/212670>\
**Category:** Logstash\
**Created:** [December 20, 2019, 1:51pm UTC](https://discuss.elastic.co/t/nested-grok/212670 "2019-12-20T13:51:16Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![Devopsio](https://avatars.discourse-cdn.com/v4/letter/d/ebca7d/32.png) [@Devopsio](https://discuss.elastic.co/u/Devopsio)\
**Post date:** [December 20, 2019, 1:51pm UTC](https://discuss.elastic.co/t/nested-grok/212670/1 "2019-12-20T13:51:16Z")

</div>

Hi. I'm trying to make a 'dynamic' parsing of a URL by this grok pipeline.  
 ![eee](https://us1.discourse-cdn.com/elastic/original/3X/e/3/e3248fa194b027d00374a7dba5819b19f429a892.png)

```
if [container][image][name] =~ /nginx/ {
grok{
 match => { "message" => ["%{IPORHOST:[nginx][access][remote_ip]} - %{DATA:[nginx][access] 
[user_name]} \[%{HTTPDATE:[nginx][access][time]}\] \"%{WORD:[nginx][access][method]} % 
{DATA:[nginx][access][url]} HTTP/%{NUMBER:[nginx][access][http_version]}\" %{NUMBER: 
[nginx][access][response_code]} %{NUMBER:[nginx][access][body_sent][bytes]} \"%{DATA: 
[nginx][access][referrer]}\" \"%{DATA:[nginx][access][agent]}\""] }
  remove_field => "message"
   if [nginx][access][url] != "/" { match => { "nginx.access.url" => ["%{GREEDYDATA:uri_stem}\?% 
{GREEDYDATA:uri_query}"] } }
}
}

```

For some reason, it doesn't work and I don't know why. Help me, please. The condition in the grok is because a URL with / only won't display.

---

<div class="post-metadata">

**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:** [December 20, 2019, 6:54pm UTC](https://discuss.elastic.co/t/nested-grok/212670/2 "2019-12-20T18:54:12Z")

</div>

> [@Devopsio](#):
>
> if [nginx][access][url] != "/" { match =\> { "nginx.access.url" =\> ...

That should be

```
if [nginx][access][url] != "/" { match => { "[nginx][access][url]" => ...

```

---

<div class="post-metadata">

**Author:** ![Devopsio](https://avatars.discourse-cdn.com/v4/letter/d/ebca7d/32.png) [@Devopsio](https://discuss.elastic.co/u/Devopsio)\
**Post date:** [December 21, 2019, 7:53am UTC](https://discuss.elastic.co/t/nested-grok/212670/3 "2019-12-21T07:53:10Z")

</div>

Didn't help. Perhaps my 'if' isn't correct?

---

<div class="post-metadata">

**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:** [December 21, 2019, 1:56pm UTC](https://discuss.elastic.co/t/nested-grok/212670/4 "2019-12-21T13:56:35Z")

</div>

You cannot make the match conditional, the entire filter has to be conditional, so

```
if [nginx][access][url] != "/" {
    grok { match => { "[nginx][access][url]" => ...
}
```

---

<div class="post-metadata">

**Author:** ![Devopsio](https://avatars.discourse-cdn.com/v4/letter/d/ebca7d/32.png) [@Devopsio](https://discuss.elastic.co/u/Devopsio)\
**Post date:** [December 21, 2019, 2:01pm UTC](https://discuss.elastic.co/t/nested-grok/212670/5 "2019-12-21T14:01:02Z")

</div>

```
  if [nginx][access][url] != '/' {
       grok { { match => { "[nginx][access][url]" => ["%{GREEDYDATA:[nginx][access][uri][type]}/% 
  {GREEDYDATA:[nginx][access][uri][query]}"] } } }

```

That didn't work too. What am I missing?

---

<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:** [January 18, 2020, 2:01pm UTC](https://discuss.elastic.co/t/nested-grok/212670/6 "2020-01-18T14:01:02Z")

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