A pattern set contains expressions that identify data patterns in the output of a token labeling operation. You can use pattern sets to analyze the Tokenized Data output port and write matching strings to one or more output ports. Use pattern sets in Parser transformations that use pattern parsing mode.
For example, you can configure a Parser transformation to use pattern sets that identify names and initials. This transformation uses the pattern sets to analyze the output of a Labler transformation in token labeling mode. You can configure the Parser transformation to write names and initials in the output to separate ports.