Utterance vectors are split by the utterance marker. Note that if
more than one element, the separate elements will remain separate.
cleaned_source_to_utterance_vector( x, utteranceMarker = rock::opts$get("utteranceMarker"), fixed = FALSE, perl = TRUE )
The character vector.
The utterance marker (by default, a newline character conform the ROCK standard).
utteranceMarker is a regular expression.
utteranceMarker is a regular expression, whether it is
a perl regular expression.
A character vector with separate utterances, split
cleaned_source_to_utterance_vector("first\nsecond\nthird"); #>  "first" "second" "third"