exact match
finds only the %[collocate]% you type

starting with
type letters which each collocate should have at the beginning

ending with
type letters which each collocate should have at the end

containing
type letters which each collocate should have at the beginning, in the middle or at the end

matching regex
use a %[regex|regular expression]% for detailed critera
this is how to find several words: ^(dog|cat|rabbit|duck)$