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Note that grok ingest processor patterns are not anchored #11182

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Note that grok ingest processor patterns are not anchored #11182

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355727a
Note that grok ingest processor patterns are not anchored
hackery Oct 3, 2025
feac586
Grok ingest processor: add anchoring to pattern examples
hackery Oct 4, 2025
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8 changes: 5 additions & 3 deletions _ingest-pipelines/processors/grok.md
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Expand Up @@ -21,6 +21,8 @@ For a list of available predefined patterns, see [Grok patterns](https://github.

The `grok` processor is built on the [Oniguruma regular expression library](https://github.com/kkos/oniguruma/blob/master/doc/RE) and supports all the patterns from that library. You can use the [Grok Debugger](https://grokdebugger.com/) tool to test and debug your grok expressions.

Note that patterns are *not anchored* - for performance and reliability it is advisable to include at least a start-of-line anchor (`^`)

## Syntax

The following is the basic syntax for the `grok` processor:
Expand Down Expand Up @@ -69,7 +71,7 @@ PUT _ingest/pipeline/log_line
{
"grok": {
"field": "message",
"patterns": ["%{IPORHOST:clientip} %{HTTPDATE:timestamp} %{NUMBER:response_status:int}"]
"patterns": ["^%{IPORHOST:clientip} %{HTTPDATE:timestamp} %{NUMBER:response_status:int}"]
}
}
]
Expand Down Expand Up @@ -158,7 +160,7 @@ PUT _ingest/pipeline/log_line
{
"grok": {
"field": "message",
"patterns": ["The issue number %{NUMBER:issue_number} is %{STATUS:status}"],
"patterns": ["^The issue number %{NUMBER:issue_number} is %{STATUS:status}"],
"pattern_definitions" : {
"NUMBER" : "\\d{3,4}",
"STATUS" : "open|closed"
Expand All @@ -182,7 +184,7 @@ PUT _ingest/pipeline/log_line
{
"grok": {
"field": "message",
"patterns": ["%{HTTPDATE:timestamp} %{IPORHOST:clientip}", "%{IPORHOST:clientip} %{HTTPDATE:timestamp} %{NUMBER:response_status:int}"],
"patterns": ["^%{HTTPDATE:timestamp} %{IPORHOST:clientip}", "%{IPORHOST:clientip} %{HTTPDATE:timestamp} %{NUMBER:response_status:int}"],
"trace_match": true
}
}
Expand Down