I am using a case insensitive search in Mongo, something similar to https://stackoverflow.com/q/5500823/1028488.
ie I am using a regex with options i. But I am am ha
You can use '$regex':'^win$' or /^win$/i (notice no quote on the second one)
'$regex':'^win$'
/^win$/i
Source here : Regex in queries with Mongo