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https://issues.apache.org/jira/browse/METRON-1643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16534916#comment-16534916
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ASF GitHub Bot commented on METRON-1643:
----------------------------------------
Github user nickwallen commented on a diff in the pull request:
https://github.com/apache/metron/pull/1083#discussion_r200672238
--- Diff: metron-platform/metron-parsers/README.md ---
@@ -337,6 +337,28 @@ The following config will rename the fields
`old_field` and `different_old_field
]
}
```
+* `REGEX_SELECT` : This transformation lets users set an output field to
one of a set of possibilities based on matching regexes. This transformation is
useful when the number or conditions are large enough to make a stellar
language match statement unwieldy.
+
+The following config will set the field `my_output` to one of the
+following, dependent upon the value of the `my_input` field:
+* `awesome` if `my_input` starts with `metron` or `mortron`
+* `boo` if `my_input` starts with `scary`
+```
+{
+...
+ "fieldTransformations" : [
+ {
+ "transformation" : "REGEX_SELECT"
+ , "input" : "my_input"
+ , "output" : "my_output"
+ , "config" : {
+ "awesome" : [ "^metron.*", "^mortron.*" ],
--- End diff --
A little nit. It makes it harder to grok the docs when you use
non-sensical phrases like 'boo', 'scary', etc in the primary example. Is there
an actual use case that we could show here instead?
> Create a REGEX_ROUTING field transformation
> -------------------------------------------
>
> Key: METRON-1643
> URL: https://issues.apache.org/jira/browse/METRON-1643
> Project: Metron
> Issue Type: Improvement
> Reporter: Casey Stella
> Priority: Major
>
> A relatively common pattern is to choose the value of a field based on if
> another field matches a set of regexes. This can be done via stellar with
> match, but if the list of possible regexes are large, that can be unwieldy.
> To ease that burden, we should have a REGEX_ROUTING field transformation.
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