code: function init() {
    var keys = ['\\\\', '\\[', '\\]']
    var key
  
    for (key in groff) {
      keys.push(key)
      escapes[key] = groff[key]
    }
  
    return new RegExp(keys.sort(longest).join('|'), 'g')
  }
docs: /* Create a regex from the escapes.