Querying strings that contains numbers doesn't work

Querying in general works well.

However when I queue a string with numbers (e.g. m9drd7ckjdwkwxav), it doesn't reflect. I suppose its due to some issues regarding regex. Not sure how to resolve it though.

```
router.get('/merchant',
token({ required: true }),
query({ q: { paths: ['merchantId'] } }),
indexByMerchant)
```
The above works when querying "ckjdwkwxav", however once a number is being added then the query doesnt work anymore