Work around regex_replace issue in GCC<4.9
Work around regex_replace issue in GCC<4.9

GCC pre 4.9 has issue with template arg deduction which means old call passing char[2] to std::regex_replace as replacement string fails to build.
oktal/rest,oktal/pistache,oktal/pistache,oktal/pistache,oktal/pistache,oktal/rest,oktal/pistache,oktal/rest,oktal/rest