Seth's fixes to regex processing.

eeschema/sch_connection.cpp

@@ -369,13 +369,27 @@ bool SCH_CONNECTION::IsBusLabel( const wxString& aLabel )
 
 bool SCH_CONNECTION::IsBusVectorLabel( const wxString& aLabel )
 {
+    try
+    {
         return std::regex_match( std::string( aLabel.mb_str() ), bus_label_re );
+    }
+    catch( ... )
+    {
+        return false;
+    }
 }
 
 
 bool SCH_CONNECTION::IsBusGroupLabel( const wxString& aLabel )
 {
+    try
+    {
         return std::regex_match( std::string( aLabel.mb_str() ), bus_group_label_re );
+    }
+    catch( ... )
+    {
+        return false;
+    }
 }
 
 
@@ -385,11 +399,18 @@ void SCH_CONNECTION::ParseBusVector( wxString aVector, wxString* aName,
     auto ss_vector = std::string( aVector.mb_str() );
     std::smatch matches;
 
+    try
+    {
         if( !std::regex_match( ss_vector, matches, bus_label_re ) )
         {
             wxFAIL_MSG( wxT( "<" ) + aVector + wxT( "> is not a valid bus vector." ) );
             return;
         }
+    }
+    catch( ... )
+    {
+        return;
+    }
 
     *aName = wxString( matches[1] );
     wxString numberString( matches[2] );
@@ -436,10 +457,17 @@ bool SCH_CONNECTION::ParseBusGroup( wxString aGroup, wxString* aName,
     auto ss_group = std::string( aGroup.mb_str() );
     std::smatch matches;
 
+    try
+    {
         if( !std::regex_match( ss_group, matches, bus_group_label_re ) )
         {
             return false;
         }
+    }
+    catch( ... )
+    {
+        return false;
+    }
 
     *aName = wxString( matches[1] );