| Parse keywords into a Set of Strings. This method recognizes phrases
(marked using quotation marks) and drops common words (i.e. and, or, not,
to, the, etc.) if they are not part of a phrase. Each element of the
resulting Set will be a single term or a phrase.
Parameters:
inputString - the input a user has submitted (i.e. from an HTML input field in a form) a Set containing individual search terms or phrases or null ifinputString is null or empty. |