https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69794
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Priority|P3 |P2 Known to work| |5.1.0, 5.2.0 Target Milestone|--- |5.4 Summary|[5 Regression] |[5/6 Regression] |std::regex_search match |std::regex_search match |failure with regex object |failure with regex object |with flags grep|icase |with flags grep|icase Known to fail| |5.3.0, 6.0 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- 5.1 and 5.2 work for me.