diff --git a/applications/test/stringList/Test-stringList.C b/applications/test/stringList/Test-stringList.C
index 60db8cfc7c..0ed3416202 100644
--- a/applications/test/stringList/Test-stringList.C
+++ b/applications/test/stringList/Test-stringList.C
@@ -53,7 +53,7 @@ int main(int argc, char *argv[])
 
     Info<< "stringList " << strLst << nl;
 
-    labelList matches = findStrings(".*ee.*", strLst);
+    labelList matches = findStrings(regExp(".*ee.*"), strLst);
 
     Info<< "matches found for regexp .*ee.* :" << nl << matches << nl;
     forAll(matches, i)
@@ -71,7 +71,7 @@ int main(int argc, char *argv[])
     }
     Info<< endl;
 
-    stringList subLst = subsetStrings(".*ee.*", strLst);
+    stringList subLst = subsetStrings(regExp(".*ee.*"), strLst);
     Info<< "subset stringList: " << subLst << nl;
 
     subLst = subsetStrings(reLst, strLst);
@@ -80,7 +80,7 @@ int main(int argc, char *argv[])
     inplaceSubsetStrings(reLst, strLst);
     Info<< "subsetted stringList: " << strLst << nl;
 
-    inplaceSubsetStrings(".*l.*", strLst);
+    inplaceSubsetStrings(regExp(".*l.*"), strLst);
     Info<< "subsetted stringList: " << strLst << nl;
 
     Info<< "\nEnd\n" << endl;
diff --git a/applications/utilities/preProcessing/changeDictionary/changeDictionary.C b/applications/utilities/preProcessing/changeDictionary/changeDictionary.C
index e0697c2861..5942e46429 100644
--- a/applications/utilities/preProcessing/changeDictionary/changeDictionary.C
+++ b/applications/utilities/preProcessing/changeDictionary/changeDictionary.C
@@ -178,7 +178,6 @@ bool addEntry
 }
 
 
-
 // List of indices into thisKeys
 labelList findMatches
 (
@@ -194,19 +193,19 @@ labelList findMatches
     {
         // Wildcard match
         matches = findStrings(key, thisKeys);
-
     }
     else if (shortcuts.size())
     {
         // See if patchGroups expand to valid thisKeys
         labelList indices = findStrings(key, shortcutNames);
-        forAll(indices, i)
+
+        for (const label idx : indices)
         {
-            const word& name = shortcutNames[indices[i]];
+            const word& name = shortcutNames[idx];
             const wordList& keys = shortcuts[name];
             forAll(keys, j)
             {
-                label index = thisKeys.find(keys[j]);
+                const label index = thisKeys.find(keys[j]);
                 if (index != -1)
                 {
                     matches.append(index);
diff --git a/applications/utilities/surface/surfacePatch/surfacePatch.C b/applications/utilities/surface/surfacePatch/surfacePatch.C
index 22a2bfb747..4d9ed0247f 100644
--- a/applications/utilities/surface/surfacePatch/surfacePatch.C
+++ b/applications/utilities/surface/surfacePatch/surfacePatch.C
@@ -137,6 +137,7 @@ int main(int argc, char *argv[])
 
                     labelList regionIDs =
                         findStrings(regionName, surf.regions());
+
                     if (modifier().modify(regionIDs, surf))
                     {
                         changed = true;
diff --git a/src/OpenFOAM/meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.C b/src/OpenFOAM/meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.C
index 7f77ccd6f7..b1e1dac7f1 100644
--- a/src/OpenFOAM/meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.C
+++ b/src/OpenFOAM/meshes/polyMesh/polyBoundaryMesh/polyBoundaryMesh.C
@@ -576,63 +576,65 @@ Foam::labelList Foam::polyBoundaryMesh::findIndices
 {
     DynamicList<label> indices;
 
-    if (!key.empty())
+    if (key.empty())
     {
-        if (key.isPattern())
+        // no-op
+    }
+    else if (key.isPattern())
+    {
+        const regExp keyRe(key);
+
+        indices = findStrings(keyRe, this->names());
+
+        if (usePatchGroups && groupPatchIDs().size())
         {
-            indices = findStrings(key, this->names());
+            labelHashSet indexSet(indices);
 
-            if (usePatchGroups && groupPatchIDs().size())
+            const wordList allGroupNames = groupPatchIDs().toc();
+            labelList groupIDs = findStrings(keyRe, allGroupNames);
+            forAll(groupIDs, i)
             {
-                labelHashSet indexSet(indices);
-
-                const wordList allGroupNames = groupPatchIDs().toc();
-                labelList groupIDs = findStrings(key, allGroupNames);
-                forAll(groupIDs, i)
+                const word& grpName = allGroupNames[groupIDs[i]];
+                const labelList& patchIDs = groupPatchIDs()[grpName];
+                forAll(patchIDs, j)
                 {
-                    const word& grpName = allGroupNames[groupIDs[i]];
-                    const labelList& patchIDs = groupPatchIDs()[grpName];
-                    forAll(patchIDs, j)
+                    if (indexSet.insert(patchIDs[j]))
                     {
-                        if (indexSet.insert(patchIDs[j]))
-                        {
-                            indices.append(patchIDs[j]);
-                        }
+                        indices.append(patchIDs[j]);
                     }
                 }
             }
         }
-        else
+    }
+    else
+    {
+        // Literal string. Special version of above to avoid
+        // unnecessary memory allocations
+
+        indices.setCapacity(1);
+        forAll(*this, i)
         {
-            // Literal string. Special version of above to avoid
-            // unnecessary memory allocations
-
-            indices.setCapacity(1);
-            forAll(*this, i)
+            if (key == operator[](i).name())
             {
-                if (key == operator[](i).name())
-                {
-                    indices.append(i);
-                    break;
-                }
+                indices.append(i);
+                break;
             }
+        }
 
-            if (usePatchGroups && groupPatchIDs().size())
+        if (usePatchGroups && groupPatchIDs().size())
+        {
+            const auto iter = groupPatchIDs().cfind(key);
+
+            if (iter.found())
             {
-                const HashTable<labelList>::const_iterator iter =
-                    groupPatchIDs().find(key);
+                labelHashSet indexSet(indices);
 
-                if (iter.found())
+                const labelList& patchIDs = iter();
+                forAll(patchIDs, j)
                 {
-                    labelHashSet indexSet(indices);
-
-                    const labelList& patchIDs = iter();
-                    forAll(patchIDs, j)
+                    if (indexSet.insert(patchIDs[j]))
                     {
-                        if (indexSet.insert(patchIDs[j]))
-                        {
-                            indices.append(patchIDs[j]);
-                        }
+                        indices.append(patchIDs[j]);
                     }
                 }
             }
@@ -645,26 +647,27 @@ Foam::labelList Foam::polyBoundaryMesh::findIndices
 
 Foam::label Foam::polyBoundaryMesh::findIndex(const keyType& key) const
 {
-    if (!key.empty())
+    if (key.empty())
     {
-        if (key.isPattern())
-        {
-            labelList indices = this->findIndices(key);
+        // no-op
+    }
+    else if (key.isPattern())
+    {
+        labelList indices = this->findIndices(key);
 
-            // return first element
-            if (!indices.empty())
-            {
-                return indices[0];
-            }
-        }
-        else
+        // return first element
+        if (!indices.empty())
         {
-            forAll(*this, i)
+            return indices[0];
+        }
+    }
+    else
+    {
+        forAll(*this, i)
+        {
+            if (key == operator[](i).name())
             {
-                if (key == operator[](i).name())
-                {
-                    return i;
-                }
+                return i;
             }
         }
     }
diff --git a/src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.C b/src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.C
index 11a94d7c88..3cfa28e6d7 100644
--- a/src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.C
+++ b/src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.C
@@ -342,25 +342,26 @@ Foam::labelList Foam::ZoneMesh<ZoneType, MeshType>::findIndices
 {
     labelList indices;
 
-    if (!key.empty())
+    if (key.empty())
     {
-        if (key.isPattern())
+        // no-op
+    }
+    else if (key.isPattern())
+    {
+        indices = findStrings(key, this->names());
+    }
+    else
+    {
+        indices.setSize(this->size());
+        label count = 0;
+        forAll(*this, i)
         {
-            indices = findStrings(key, this->names());
-        }
-        else
-        {
-            indices.setSize(this->size());
-            label count = 0;
-            forAll(*this, i)
+            if (key == operator[](i).name())
             {
-                if (key == operator[](i).name())
-                {
-                    indices[count++] = i;
-                }
+                indices[count++] = i;
             }
-            indices.setSize(count);
         }
+        indices.setSize(count);
     }
 
     return indices;
@@ -373,26 +374,26 @@ Foam::label Foam::ZoneMesh<ZoneType, MeshType>::findIndex
     const keyType& key
 ) const
 {
-    if (!key.empty())
+    if (key.empty())
     {
-        if (key.isPattern())
-        {
-            labelList indices = this->findIndices(key);
+        // no-op
+    }
+    else if (key.isPattern())
+    {
+        labelList indices = this->findIndices(key);
 
-            // return first element
-            if (!indices.empty())
-            {
-                return indices[0];
-            }
-        }
-        else
+        if (!indices.empty())
         {
-            forAll(*this, i)
+            return indices.first();  // first match
+        }
+    }
+    else
+    {
+        forAll(*this, i)
+        {
+            if (key == operator[](i).name())
             {
-                if (key == operator[](i).name())
-                {
-                    return i;
-                }
+                return i;
             }
         }
     }
@@ -412,7 +413,7 @@ Foam::label Foam::ZoneMesh<ZoneType, MeshType>::findZoneID
 
     forAll(zones, zonei)
     {
-        if (zones[zonei].name() == zoneName)
+        if (zoneName == zones[zonei].name())
         {
             return zonei;
         }
diff --git a/src/OpenFOAM/primitives/strings/lists/stringListOps.H b/src/OpenFOAM/primitives/strings/lists/stringListOps.H
index e8a3f87c12..485eb4bfb0 100644
--- a/src/OpenFOAM/primitives/strings/lists/stringListOps.H
+++ b/src/OpenFOAM/primitives/strings/lists/stringListOps.H
@@ -43,7 +43,7 @@ SourceFiles
 
 namespace Foam
 {
-    //- Extract list indices
+    //- Extract list indices for all matches.
     //  The unary match predicate has the following signature:
     //  \code
     //  bool operator()(const std::string& text);
@@ -78,26 +78,17 @@ namespace Foam
     template<class StringType>
     labelList findStrings
     (
-        const char* re,
+        const keyType& matcher,
         const UList<StringType>& input,
         const bool invert=false
     )
     {
-        return findMatchingStrings(regExp(re), input, invert);
-    }
-
-
-    //- Return list indices for strings matching the regular expression
-    //  Template partial specialization of findMatchingStrings
-    template<class StringType>
-    labelList findStrings
-    (
-        const std::string& re,
-        const UList<StringType>& input,
-        const bool invert=false
-    )
-    {
-        return findMatchingStrings(regExp(re), input, invert);
+        return
+        (
+            matcher.isPattern()
+          ? findMatchingStrings(regExp(matcher), input, invert)
+          : findMatchingStrings(matcher, input, invert)
+        );
     }
 
 
@@ -178,25 +169,17 @@ namespace Foam
     template<class StringListType>
     StringListType subsetStrings
     (
-        const char* re,
+        const keyType& matcher,
         const StringListType& input,
         const bool invert=false
     )
     {
-        return subsetMatchingStrings(regExp(re), input, invert);
-    }
-
-    //- Extract elements of StringList when regular expression matches
-    //  Template partial specialization of subsetMatchingStrings
-    template<class StringListType>
-    StringListType subsetStrings
-    (
-        const std::string& re,
-        const StringListType& input,
-        const bool invert=false
-    )
-    {
-        return subsetMatchingStrings(regExp(re), input, invert);
+        return
+        (
+            matcher.isPattern()
+          ? subsetMatchingStrings(regExp(matcher), input, invert)
+          : subsetMatchingStrings(matcher, input, invert)
+        );
     }
 
     //- Extract elements of StringList when regular expression matches
@@ -265,30 +248,22 @@ namespace Foam
         inplaceSubsetMatchingStrings(matcher, input, invert);
     }
 
-    //- Inplace extract elements of StringList when regular expression matches
-    //  Template partial specialization of inplaceSubsetMatchingStrings
+    //- Extract elements of StringList when regular expression matches
+    //  Template partial specialization of subsetMatchingStrings
     template<class StringListType>
     void inplaceSubsetStrings
     (
-        const char* re,
+        const keyType& matcher,
         StringListType& input,
         const bool invert=false
     )
     {
-        inplaceSubsetMatchingStrings(regExp(re), input, invert);
-    }
-
-    //- Inplace extract elements of StringList when regular expression matches
-    //  Template partial specialization of inplaceSubsetMatchingStrings
-    template<class StringListType>
-    void inplaceSubsetStrings
-    (
-        const std::string& re,
-        StringListType& input,
-        const bool invert=false
-    )
-    {
-        inplaceSubsetMatchingStrings(regExp(re), input, invert);
+        return
+        (
+            matcher.isPattern()
+          ? inplaceSubsetMatchingStrings(regExp(matcher), input, invert)
+          : inplaceSubsetMatchingStrings(matcher, input, invert)
+        );
     }
 
     //- Inplace extract elements of StringList when regular expression matches
@@ -330,6 +305,79 @@ namespace Foam
         inplaceSubsetMatchingStrings(wordRes::matcher(regexs), input, invert);
     }
 
+
+    //- Find using C-string as a regex
+    //  \deprecated (FEB-2018) Treating string as regex may be inefficient
+    //      and lead to unintended results.
+    //      Use regExp, keyType, wordRe instead, or findMatchingStrings()
+    template<class StringType>
+    labelList findStrings
+    (
+        const char* disallowed,
+        const UList<StringType>& input,
+        const bool invert=false
+    ) = delete;
+
+    //- Find using string as a regex
+    //  \deprecated (FEB-2018) Treating string as regex may be inefficient
+    //      and lead to unintended results.
+    //      Use regExp, keyType, wordRe instead, or findMatchingStrings()
+    template<class StringType>
+    labelList findStrings
+    (
+        const std::string& disallowed,
+        const UList<StringType>& input,
+        const bool invert=false
+    ) = delete;
+
+    //- Subset using C-string as a regex
+    //  \deprecated (FEB-2018) Treating string as regex may be inefficient
+    //      and lead to unintended results.
+    //      Use regExp, keyType, wordRe instead, or subsetMatchingStrings()
+    template<class StringListType>
+    StringListType subsetStrings
+    (
+        const char* disallowed,
+        const StringListType& input,
+        const bool invert=false
+    ) = delete;
+
+    //- Subset using string as a regex
+    //  \deprecated (FEB-2018) Treating string as regex may be inefficient
+    //      and lead to unintended results.
+    //      Use regExp, keyType, wordRe instead, or subsetMatchingStrings()
+    template<class StringListType>
+    StringListType subsetStrings
+    (
+        const std::string& disallowed,
+        const StringListType& input,
+        const bool invert=false
+    ) = delete;
+
+    //- Subset using C-string as a regex
+    //  \deprecated (FEB-2018) Treating string as regex may be inefficient
+    //      and lead to unintended results.
+    //      Use regExp, keyType, wordRe instead, or inplaceSubsetMatchingStrings()
+    template<class StringListType>
+    void inplaceSubsetStrings
+    (
+        const char* disallowed,
+        StringListType& input,
+        const bool invert=false
+    ) = delete;
+
+    //- Subset using string as a regex
+    //  \deprecated (FEB-2018) Treating string as regex may be inefficient
+    //      and lead to unintended results.
+    //      Use keyType, wordRe instead, or inplaceSubsetMatchingStrings()
+    template<class StringListType>
+    void inplaceSubsetStrings
+    (
+        const std::string& disallowed,
+        StringListType& input,
+        const bool invert=false
+    ) = delete;
+
 }
 
 
diff --git a/src/conversion/ensight/mesh/ensightMesh.C b/src/conversion/ensight/mesh/ensightMesh.C
index aa91fa36b9..9ba6b17fcc 100644
--- a/src/conversion/ensight/mesh/ensightMesh.C
+++ b/src/conversion/ensight/mesh/ensightMesh.C
@@ -149,11 +149,7 @@ void Foam::ensightMesh::correct()
             if (!matcher.empty())
             {
                 useAll = false;
-                matched = findMatchingStrings
-                (
-                    matcher,
-                    patchNames
-                );
+                matched = findStrings(matcher, patchNames);
             }
         }
 
@@ -248,11 +244,7 @@ void Foam::ensightMesh::correct()
         const wordRes& matcher = option().faceZoneSelection();
 
         wordList selectZones = mesh_.faceZones().names();
-        inplaceSubsetMatchingStrings
-        (
-            matcher,
-            selectZones
-        );
+        subsetMatchingStrings(matcher, selectZones);
 
         // have same order as later with sortedToc()
         Foam::sort(selectZones);
diff --git a/src/finiteArea/faMesh/faBoundaryMesh/faBoundaryMesh.C b/src/finiteArea/faMesh/faBoundaryMesh/faBoundaryMesh.C
index 9be62fad52..8000d31334 100644
--- a/src/finiteArea/faMesh/faBoundaryMesh/faBoundaryMesh.C
+++ b/src/finiteArea/faMesh/faBoundaryMesh/faBoundaryMesh.C
@@ -194,25 +194,26 @@ Foam::labelList Foam::faBoundaryMesh::findIndices
 {
     DynamicList<label> indices;
 
-    if (!key.empty())
+    if (key.empty())
     {
-        if (key.isPattern())
-        {
-            indices = findStrings(key, this->names());
-        }
-        else
-        {
-            // Literal string. Special version of above to avoid
-            // unnecessary memory allocations
+        // no-op
+    }
+    else if (key.isPattern())
+    {
+        indices = findStrings(key, this->names());
+    }
+    else
+    {
+        // Literal string. Special version of above to avoid
+        // unnecessary memory allocations
 
-            indices.setCapacity(1);
-            forAll(*this, i)
+        indices.setCapacity(1);
+        forAll(*this, i)
+        {
+            if (key == operator[](i).name())
             {
-                if (key == operator[](i).name())
-                {
-                    indices.append(i);
-                    break;
-                }
+                indices.append(i);
+                break;
             }
         }
     }
diff --git a/src/lagrangian/intermediate/submodels/CloudFunctionObjects/ParticleErosion/ParticleErosion.C b/src/lagrangian/intermediate/submodels/CloudFunctionObjects/ParticleErosion/ParticleErosion.C
index 3f85368d49..fec798351b 100644
--- a/src/lagrangian/intermediate/submodels/CloudFunctionObjects/ParticleErosion/ParticleErosion.C
+++ b/src/lagrangian/intermediate/submodels/CloudFunctionObjects/ParticleErosion/ParticleErosion.C
@@ -77,27 +77,27 @@ Foam::ParticleErosion<CloudType>::ParticleErosion
     psi_(this->coeffDict().template lookupOrDefault<scalar>("psi", 2.0)),
     K_(this->coeffDict().template lookupOrDefault<scalar>("K", 2.0))
 {
-    const wordList allPatchNames = owner.mesh().boundaryMesh().names();
-    wordList patchName(this->coeffDict().lookup("patches"));
+    const wordList allPatchNames(owner.mesh().boundaryMesh().names());
+    const wordReList patchNames(this->coeffDict().lookup("patches"));
 
-    labelHashSet uniquePatchIDs;
-    forAllReverse(patchName, i)
+    labelHashSet uniqIds;
+    for (const wordRe& re : patchNames)
     {
-        labelList patchIDs = findStrings(patchName[i], allPatchNames);
+        labelList ids = findStrings(re, allPatchNames);
 
-        if (patchIDs.empty())
+        if (ids.empty())
         {
             WarningInFunction
-                << "Cannot find any patch names matching " << patchName[i]
+                << "Cannot find any patch names matching " << re
                 << endl;
         }
 
-        uniquePatchIDs.insert(patchIDs);
+        uniqIds.insert(ids);
     }
 
-    patchIDs_ = uniquePatchIDs.toc();
+    patchIDs_ = uniqIds.sortedToc();
 
-    // trigger ther creation of the Q field
+    // trigger creation of the Q field
     preEvolve();
 }
 
@@ -117,13 +117,6 @@ Foam::ParticleErosion<CloudType>::ParticleErosion
 {}
 
 
-// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
-
-template<class CloudType>
-Foam::ParticleErosion<CloudType>::~ParticleErosion()
-{}
-
-
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
 template<class CloudType>
diff --git a/src/lagrangian/intermediate/submodels/CloudFunctionObjects/ParticleErosion/ParticleErosion.H b/src/lagrangian/intermediate/submodels/CloudFunctionObjects/ParticleErosion/ParticleErosion.H
index b1ffd61fcc..d92c6351f1 100644
--- a/src/lagrangian/intermediate/submodels/CloudFunctionObjects/ParticleErosion/ParticleErosion.H
+++ b/src/lagrangian/intermediate/submodels/CloudFunctionObjects/ParticleErosion/ParticleErosion.H
@@ -120,7 +120,7 @@ public:
 
 
     //- Destructor
-    virtual ~ParticleErosion();
+    virtual ~ParticleErosion() = default;
 
 
     // Member Functions
diff --git a/src/lagrangian/intermediate/submodels/CloudFunctionObjects/PatchPostProcessing/PatchPostProcessing.C b/src/lagrangian/intermediate/submodels/CloudFunctionObjects/PatchPostProcessing/PatchPostProcessing.C
index d282f6d9f6..21752df47f 100644
--- a/src/lagrangian/intermediate/submodels/CloudFunctionObjects/PatchPostProcessing/PatchPostProcessing.C
+++ b/src/lagrangian/intermediate/submodels/CloudFunctionObjects/PatchPostProcessing/PatchPostProcessing.C
@@ -134,33 +134,32 @@ Foam::PatchPostProcessing<CloudType>::PatchPostProcessing
     times_(),
     patchData_()
 {
-    const wordList allPatchNames = owner.mesh().boundaryMesh().names();
-    wordList patchName(this->coeffDict().lookup("patches"));
+    const wordList allPatchNames(owner.mesh().boundaryMesh().names());
+    const wordReList patchNames(this->coeffDict().lookup("patches"));
 
-    labelHashSet uniquePatchIDs;
-    forAllReverse(patchName, i)
+    labelHashSet uniqIds;
+    for (const wordRe& re : patchNames)
     {
-        labelList patchIDs = findStrings(patchName[i], allPatchNames);
+        labelList ids = findStrings(re, allPatchNames);
 
-        if (patchIDs.empty())
+        if (ids.empty())
         {
             WarningInFunction
-                << "Cannot find any patch names matching " << patchName[i]
+                << "Cannot find any patch names matching " << re
                 << endl;
         }
 
-        uniquePatchIDs.insert(patchIDs);
+        uniqIds.insert(ids);
     }
 
-    patchIDs_ = uniquePatchIDs.toc();
+    patchIDs_ = uniqIds.sortedToc();
 
     if (debug)
     {
-        forAll(patchIDs_, i)
+        for (const label patchi : patchIDs_)
         {
-            const label patchi = patchIDs_[i];
-            const word& patchName = owner.mesh().boundaryMesh()[patchi].name();
-            Info<< "Post-process patch " << patchName << endl;
+            Info<< "Post-process patch "
+                << owner.mesh().boundaryMesh()[patchi].name() << endl;
         }
     }
 
@@ -183,13 +182,6 @@ Foam::PatchPostProcessing<CloudType>::PatchPostProcessing
 {}
 
 
-// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
-
-template<class CloudType>
-Foam::PatchPostProcessing<CloudType>::~PatchPostProcessing()
-{}
-
-
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
 template<class CloudType>
diff --git a/src/lagrangian/intermediate/submodels/CloudFunctionObjects/PatchPostProcessing/PatchPostProcessing.H b/src/lagrangian/intermediate/submodels/CloudFunctionObjects/PatchPostProcessing/PatchPostProcessing.H
index 7c9876e7dd..6a558262f1 100644
--- a/src/lagrangian/intermediate/submodels/CloudFunctionObjects/PatchPostProcessing/PatchPostProcessing.H
+++ b/src/lagrangian/intermediate/submodels/CloudFunctionObjects/PatchPostProcessing/PatchPostProcessing.H
@@ -115,7 +115,7 @@ public:
 
 
     //- Destructor
-    virtual ~PatchPostProcessing();
+    virtual ~PatchPostProcessing() = default;
 
 
     // Member Functions
diff --git a/src/lagrangian/intermediate/submodels/Kinematic/PatchInteractionModel/LocalInteraction/patchInteractionDataList.C b/src/lagrangian/intermediate/submodels/Kinematic/PatchInteractionModel/LocalInteraction/patchInteractionDataList.C
index 9033ab2b89..3f3d468e86 100644
--- a/src/lagrangian/intermediate/submodels/Kinematic/PatchInteractionModel/LocalInteraction/patchInteractionDataList.C
+++ b/src/lagrangian/intermediate/submodels/Kinematic/PatchInteractionModel/LocalInteraction/patchInteractionDataList.C
@@ -46,22 +46,22 @@ Foam::patchInteractionDataList::patchInteractionDataList
     patchGroupIDs_(this->size())
 {
     const polyBoundaryMesh& bMesh = mesh.boundaryMesh();
-    const wordList allPatchNames = bMesh.names();
+    const wordList allPatchNames(bMesh.names());
 
     const List<patchInteractionData>& items = *this;
     forAllReverse(items, i)
     {
         const word& patchName = items[i].patchName();
-        labelList patchIDs = findStrings(patchName, allPatchNames);
+        labelList ids = findIndices(allPatchNames, patchName);
 
-        if (patchIDs.empty())
+        if (ids.empty())
         {
             WarningInFunction
                 << "Cannot find any patch names matching " << patchName
                 << endl;
         }
 
-        patchGroupIDs_[i].transfer(patchIDs);
+        patchGroupIDs_[i].transfer(ids);
     }
 
     // Check that all patches are specified
diff --git a/src/meshTools/coordinateSystems/coordinateSystems.C b/src/meshTools/coordinateSystems/coordinateSystems.C
index d744baa804..16020e0d18 100644
--- a/src/meshTools/coordinateSystems/coordinateSystems.C
+++ b/src/meshTools/coordinateSystems/coordinateSystems.C
@@ -101,22 +101,26 @@ const Foam::coordinateSystems& Foam::coordinateSystems::New
 Foam::labelList Foam::coordinateSystems::findIndices(const keyType& key) const
 {
     labelList indices;
-    if (key.isPattern())
+    if (key.empty())
     {
-        indices = findStrings(key, toc());
+        // no-op
+    }
+    else if (key.isPattern())
+    {
+        indices = findStrings(key, this->toc());
     }
     else
     {
-        indices.setSize(size());
-        label nFound = 0;
+        indices.setSize(this->size());
+        label count = 0;
         forAll(*this, i)
         {
             if (key == operator[](i).name())
             {
-                indices[nFound++] = i;
+                indices[count++] = i;
             }
         }
-        indices.setSize(nFound);
+        indices.setSize(count);
     }
 
     return indices;
@@ -125,13 +129,16 @@ Foam::labelList Foam::coordinateSystems::findIndices(const keyType& key) const
 
 Foam::label Foam::coordinateSystems::findIndex(const keyType& key) const
 {
-    if (key.isPattern())
+    if (key.empty())
+    {
+        // no-op
+    }
+    else if (key.isPattern())
     {
         labelList indices = findIndices(key);
-        // return first element
         if (!indices.empty())
         {
-            return indices[0];
+            return indices.first();  // first match
         }
     }
     else
@@ -145,6 +152,7 @@ Foam::label Foam::coordinateSystems::findIndex(const keyType& key) const
         }
     }
 
+    // Not found
     return -1;
 }
 
diff --git a/src/meshTools/triSurface/triSurfaceLoader/triSurfaceLoader.C b/src/meshTools/triSurface/triSurfaceLoader/triSurfaceLoader.C
index b3f0604d04..4da25b743b 100644
--- a/src/meshTools/triSurface/triSurfaceLoader/triSurfaceLoader.C
+++ b/src/meshTools/triSurface/triSurfaceLoader/triSurfaceLoader.C
@@ -120,12 +120,12 @@ Foam::label Foam::triSurfaceLoader::select(const wordRe& mat)
 
     if (mat.isPattern())
     {
-        foundIds = findMatchingStrings(mat, available_);
+        foundIds = findStrings(mat, available_);
         sort(foundIds);
     }
     else
     {
-        const word& plain = static_cast<const word&>(mat);
+        const word& plain = mat;
         if (available_.found(plain))
         {
             foundIds.append(available_[plain]);
@@ -164,7 +164,7 @@ Foam::label Foam::triSurfaceLoader::select(const UList<wordRe>& matcher)
     {
         if (mat.isPattern())
         {
-            labelList indices = findMatchingStrings(mat, available_);
+            labelList indices = findStrings(mat, available_);
             sort(indices);
 
             for (const label idx : indices)
@@ -177,7 +177,7 @@ Foam::label Foam::triSurfaceLoader::select(const UList<wordRe>& matcher)
         }
         else
         {
-            const word& plain = static_cast<const word&>(mat);
+            const word& plain = mat;
             if (available_.found(plain))
             {
                 const label idx = available_[plain];
diff --git a/src/regionModels/surfaceFilmModels/submodels/kinematic/injectionModel/curvatureSeparation/curvatureSeparation.C b/src/regionModels/surfaceFilmModels/submodels/kinematic/injectionModel/curvatureSeparation/curvatureSeparation.C
index b7cc66b63d..5f8f6a86a0 100644
--- a/src/regionModels/surfaceFilmModels/submodels/kinematic/injectionModel/curvatureSeparation/curvatureSeparation.C
+++ b/src/regionModels/surfaceFilmModels/submodels/kinematic/injectionModel/curvatureSeparation/curvatureSeparation.C
@@ -249,7 +249,7 @@ curvatureSeparation::curvatureSeparation
 
     forAllReverse(prIn, i)
     {
-        labelList patchIDs = findStrings(prIn[i].first(), allPatchNames);
+        labelList patchIDs = findIndices(allPatchNames, prIn[i].first());
         forAll(patchIDs, j)
         {
             const label patchi = patchIDs[j];