text as nullable any, startDelimiter as text, endDelimiter as text, optional startIndex as nullable any, optional endIndex as nullable any) as nullable anytext between the specified startDelimiter and endDelimiter. An optional numeric startIndex indicates which occurrence of the startDelimiter should be considered. An optional list startIndex indicates which occurrence of the startDelimiter should be considered, as well as whether indexing should be done from the start or end of the input. The endIndex is similar, except that indexing is done relative to the startIndex.