Mongo Text Searching (with partial matching)

createSearchIndices.js

  async function createTextSearchIndex(db) {
    db.collection("customers").createIndex({
      firstName: "text",
      lastName: "text",
      email: "text",
      phone: "text"
    });
  }

  async function createRegexSearchIndex(db) {
    db.collection("customers").createIndex({
      firstName: 1,
      lastName: 1,
      email: 1,
      phone: 1
    });
  }

search.js

const searchTerm = req.query.searchTerm;

const customers = await db.collection('customers).find({
  $or: [
      // the first step is to see if the exact word matches, if not then go onto the regex based search
      { 
        $text: {
          $search: searchTerm,
        }
      },
      { firstName: new RegExp(searchTerm, "i") },
      { lastName: new RegExp(searchTerm, "i") },
      { email: new RegExp(searchTerm, "i") },
      { phone: new RegExp(searchTerm, "i") }
    ]                                      
}).toArray();