The function is used to search for particles. It duplicates the functionality of the functions lemma(), stem(), form(), partofspeech() allowing to write a query in a more concise way.

The function accepts single argument. When used without arguments, the function matches any particle.

Documents matching the query.

particle() = lemma(particle) matches all particles in the text.

particle(to) = lemma(particle, to) matches all occurrences of the particle "to" in the text.