Used single quotes for single character in string::find algorithm, more efficient

src/Mod/Fem/App/FemMesh.cpp

@@ -1023,7 +1023,7 @@ void FemMesh::readNastran(const std::string &Filename)
     {
         std::getline(inputfile,line1);
         if (line1.size() == 0) continue;
-        if (!nastran_free_format && line1.find(",")!= std::string::npos)
+        if (!nastran_free_format && line1.find(',')!= std::string::npos)
             nastran_free_format = true;
         if (!nastran_free_format && line1.find("GRID*")!= std::string::npos ) //We found a Grid line
         {

src/Mod/Mesh/App/Core/MeshIO.cpp

@@ -1624,7 +1624,7 @@ bool MeshInput::LoadNastran (std::istream &rstrIn)
         if (line.find("GRID*") == 0) {
             assert(0);
         }
-        else if (line.find("*") == 0) {
+        else if (line.find('*') == 0) {
             assert(0);
         }
         // insert the read-in vertex into a map to preserve the order

src/Mod/Path/App/Path.cpp

@@ -261,7 +261,7 @@ void Toolpath::setFromGCode(const std::string instr)
             }
             mode = "comment";
             last = found;
-            found = str.find_first_of(")", found+1);
+            found = str.find_first_of(')', found+1);
         } else if (str[found] == ')') {
             // end of comment
             std::string gcodestr = str.substr(last, found-last+1);

src/Mod/TechDraw/App/HatchLine.cpp

@@ -343,7 +343,7 @@ bool  PATLineSpec::findPatternStart(std::ifstream& inFile, std::string& parmName
              (line.empty()) )  {           //is cr/lf empty?
              continue;
          } else if (nameTag == "*") {
-             commaPos = line.find(",",1);
+             commaPos = line.find(',',1);
              if (commaPos != std::string::npos) {
                   patternName = line.substr(1,commaPos-1);
              } else {
@@ -396,7 +396,7 @@ std::vector<std::string> PATLineSpec::getPatternList(std::string& parmFile)
         std::string nameTag = line.substr(0,1);               //dupl code here
         unsigned long int commaPos;
         if (nameTag == "*") {  //found a pattern
-            commaPos = line.find(",",1);
+            commaPos = line.find(',',1);
             std::string patternName;
             if (commaPos != std::string::npos) {
                  patternName = line.substr(1,commaPos-1);

src/Mod/TechDraw/App/LineGroup.cpp

@@ -148,7 +148,7 @@ std::string LineGroup::getRecordFromFile(std::string parmFile, std::string group
              (line.empty()) )  {           //is cr/lf empty?
              continue;
          } else if (nameTag == "*") {
-             commaPos = line.find(",",1);
+             commaPos = line.find(',',1);
              if (commaPos != std::string::npos) {
                   foundName = line.substr(1,commaPos-1);
              } else {