How to search Json string based values in Redis?

I am currently working on a project that uses Redis from NodeJs and a lot of the data is stored in Redis as JSON strings. What I have are a number of keys i.e.

 urn:comment:1, urn:comment:2 etc and the values contained are:

"{Id:1, CommentText:"some text here that could be quite large..." ...} etc

What I need is a way to search for strings in "CommentText".

I am new to Redis, what are my options?

Redis is not well suited for what you want. Since you want full text search functionality i strongly recommend using Elastic Search elasticsearch.org