{
let matchString = 'who . (the|that)'
let matchObj = nlp.parseMatch(matchString)
let docs=[
`who controls the British crown?`,
`Who keeps the metric system down?`,
`the leader? who's that, some kind of leader?`
]
return docs.map(str => {
let doc = nlp(str)
return doc.match(matchObj).text()
})
}