Need to ability to use suffix to avoid substituting partial matches

[rrabb]

I've encountered an issue with using json object pattern matching.

It's necessary to use suffix sometimes when there are unintended partial matches due to missing json keys in the pattern json object.
For example, be able to replace matches like @@env.css.darkStyle@@ instead of just @@env.css.darkStyle. This is needed to avoid erroneously substituting a partial match like @@env.css.darkStyle.headerColor with the @@env.css.darkStyle match (which is a serialized json object) when property "headerColor" is not found in the pattern json object under env.css.darkStyle.

Please refer to my pull request.

[rrabb]

5793b26