key Parameter

Specifies the pattern used to extract the keys from a source column by the extractkv transform. For the following data:

{ key1=value1,key2=value2 }

The keys are represented in the transform by the following parameter and value:

key:`{alpha}+{digit}`

This pattern matches all keys that begin with a letter and end with a digit. If the source data contains other keys, they do not appear in the extracted data.

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Google Cloud Dataprep Documentation