If I include additional modules on the compilation command line like this:

gdc test.d /opt/gdc/include/d2/4.6.2/std/internal/uni.d /opt/gdc/include/d2/4.6.2/std/internal/uni_tab.d

where test.d is my program, all symbols resolve OK.

Does this indicate a problem in the building of libgphobos2.a or have I made a mistake in configuring gdc
prior to compiling it ? I don't see any open issues listed for regex on

Yeah, looks like the phobos lib is missing these.
Did you properly update, i.e. with gcc/d/setup-gcc.sh -v2 --update?

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