ENH: regex matching on std::string, not Foam::string

src/OSspecific/POSIX/regExp.C

src/OSspecific/POSIX/regExp.H

src/OSspecific/POSIX/regExpI.H

src/OpenFOAM/primitives/strings/lists/wordReListMatcher.H

src/OpenFOAM/primitives/strings/lists/wordReListMatcherI.H

src/OpenFOAM/primitives/strings/string/string.H

src/OpenFOAM/primitives/strings/string/stringI.H

src/surfMesh/surfaceFormats/starcd/STARCDsurfaceFormatCore.C