Apache NiFi RecordPath Guide
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substringBefore

Returns the portion of a String value that occurs before the first occurrence of some other value.

RecordPath

Return value

substringBefore( /name, '' )

John

substringBefore( /name, 'o' )

J

substringBefore( /name, '' )

John Doe

substringBefore( /name, 'xyz' )

John Doe