ENH: patchToFace: allow patch groups in patchToFace

applications/utilities/mesh/manipulation/topoSet/topoSetDict

@@ -211,7 +211,8 @@ FoamFile
 //    source patchToFace;
 //    sourceInfo
 //    {
-//        name ".*Wall";      // Name of patch, regular expressions allowed
+//        name ".*Wall";      // Name of patch or patch group,
+//                            // (regular expressions allowed)
 //    }
 //
 //    // All faces of faceZone

src/meshTools/sets/faceSources/patchToFace/patchToFace.C

@@ -54,33 +54,34 @@ Foam::topoSetSource::addToUsageTable Foam::patchToFace::usage_
 
 void Foam::patchToFace::combine(topoSet& set, const bool add) const
 {
-    bool hasMatched = false;
-
-    forAll(mesh_.boundaryMesh(), patchI)
+    labelHashSet patchIDs = mesh_.boundaryMesh().patchSet
+    (
+        List<wordRe>(1, patchName_),
+        true,           // warn if not found
+        true            // use patch groups if available
+    );
+
+    forAllConstIter(labelHashSet, patchIDs, iter)
     {
-        const polyPatch& pp = mesh_.boundaryMesh()[patchI];
-
-        if (patchName_.match(pp.name()))
-        {
-            Info<< "    Found matching patch " << pp.name()
-                << " with " << pp.size() << " faces." << endl;
+        label patchI = iter.key();
 
-            hasMatched = true;
+        const polyPatch& pp = mesh_.boundaryMesh()[patchI];
 
+        Info<< "    Found matching patch " << pp.name()
+            << " with " << pp.size() << " faces." << endl;
 
-            for
-            (
-                label faceI = pp.start();
-                faceI < pp.start() + pp.size();
-                faceI++
-            )
-            {
-                addOrDelete(set, faceI, add);
-            }
+        for
+        (
+            label faceI = pp.start();
+            faceI < pp.start() + pp.size();
+            faceI++
+        )
+        {
+            addOrDelete(set, faceI, add);
         }
     }
 
-    if (!hasMatched)
+    if (patchIDs.empty())
     {
         WarningIn("patchToFace::combine(topoSet&, const bool)")
             << "Cannot find any patch named " << patchName_ << endl