Free search using .match()

regex-search.js

    unmappedListings() {
      return this.listings
        .filter(listing => !listing.node.abbListingID)
        .filter((listing) => {
          if (this.search) {
            const searchTerm = this.search.trim()
              .toLowerCase()
              .split(' ')
              .join('|');
            const regex = new RegExp(`(${searchTerm})`, 'g');
            const isListing = listing.node.name.toLowerCase()
              .match(regex);
            const isPmsId = listing.node['Unit Code'].toLowerCase()
              .match(regex);

            return (isListing && isListing.length > 0)
              || (isPmsId && isPmsId.length > 0);
          }

          return true;
        });
    }