Feature: Possibility for Regular Expressions in snappyHexMeshDict, surfaceFeatureExtractDict etc. for File Names

A user is able to use POSIX regular expressions for OpenFOAM's keywords as well as file names for some entries: such as refinementSurfaces and refinementRegions entries in a snappyHexMeshDict as exemplified herein: https://bugs.openfoam.org/view.php?id=527

Yet one currently cannot use this flexibility for file names in surfaceFeatureExtractDict and geometry entry of a snappyHexMeshDict. Might be useful to expand the above for the latter, I believe.

Kind regards