Regular Expression in text searches?

First off, thanks for all the hard work! Hoogle has helped me out many times :)

I just came across a problem of converting from one datatype to another. Hoogle to the rescue! -- stack hoogle ':: SubExp -> PrimExp'

However, as this gave me many results, I wanted to narrow down to functions that contained either to or from in their name. However, I needed to do two searches stack hoogle 'to :: SubExp -> PrimExp' and stack hoogle 'from :: SubExp -> PrimExp' to achive that.

It could be nice if I could do the following: stack hoogle '(to|from) :: SubExp -> PrimExp'

I guess allowing regular expressions for type searching would be a mess, so I'm guessing there might be some caveats, but I wanted to hear your thoughts on it anyway.

edit: from the commandline I can actually just use grep, but from the web interface it is not that easy.

The issue mentions Hoogle's command-line query and web interface, but names no files or tests. Start by tracing how text queries are handled in those two entry points; define how regex grouping such as (to|from) should interact with type searches, then verify the behavior in both interfaces.