Geant4RegexSensitivesConstruction: use regex_search so we do not have to fully match volume paths.

Speeds up by 50 percent the construction in fiber dual readout calorimeter with 580k volumes (108 s down to 68 s on my machine)

DDG4/plugins/Geant4RegexSensitivesConstruction.cpp

@@ -104,7 +104,7 @@ Geant4RegexSensitivesConstruction::collect_volumes(std::set<Volume>&  volumes,
     if( !path.empty() )  {
       for( const auto& match : matches )  {
         std::smatch sm;
-        bool stat = std::regex_match(path, sm, match);
+        bool stat = std::regex_search(path, sm, match);
         if( stat )  {
           volumes.insert(pv.volume());
           ++count;