Reverse regex functionality for queries

The $regex operator allows to search documents having a field which match a given regular expresion passed in the query. However, it would be interesting to have also the opossite: search documents passing a text in the query which is evaluated for matching to a field in the collection storing a regular expresión.

I wonder if this feature/improvement is already in MongoDB roadmap as it seems it would be useful for several use cases. See for example:

• http://stackoverflow.com/questions/15966991/mongodb-reverse-regex
• http://stackoverflow.com/questions/10912583/mongo-reverse-regex/23596851#23596851
• https://groups.google.com/forum/#!topic/mongodb-user/cRBR_h5EL_s,