diff --git a/lib/checkbufferoverrun.cpp b/lib/checkbufferoverrun.cpp
index 4dcb22059..1c2e262bf 100644
--- a/lib/checkbufferoverrun.cpp
+++ b/lib/checkbufferoverrun.cpp
@@ -375,15 +375,13 @@ static bool for3(const Token * const tok,
                  const bool maxMinFlipped)
 {
     assert(tok != 0);
-    if (Token::Match(tok, "%varid% += %num% )", varid) ||
-        Token::Match(tok, "%varid%  = %num% + %varid% )", varid)) {
+    if (Token::Match(tok, "%varid%  = %num% + %varid% )", varid)) {
         if (!for_maxvalue(tok->tokAt(2), min_value, max_value))
             return false;
     } else if (Token::Match(tok, "%varid% = %varid% + %num% )", varid)) {
         if (!for_maxvalue(tok->tokAt(4), min_value, max_value))
             return false;
-    } else if (Token::Match(tok, "%varid% -= %num% )", varid) ||
-               Token::Match(tok, "%varid%  = %num% - %varid% )", varid)) {
+    } else if (Token::Match(tok, "%varid% = %num% - %varid% )", varid)) {
         if (!for_maxvalue(tok->tokAt(2), min_value, max_value))
             return false;
     } else if (Token::Match(tok, "%varid% = %varid% - %num% )", varid)) {
@@ -418,7 +416,7 @@ static bool for_bailout(const Token * const tok1, unsigned int varid)
     for (const Token *loopTok = tok1; loopTok && loopTok != tok1->link(); loopTok = loopTok->next()) {
         if (loopTok->varId() == varid) {
             // Counter variable used inside loop
-            if (Token::Match(loopTok->next(), "+=|-=|++|--|=") ||
+            if (Token::Match(loopTok->next(), "++|--|=") ||
                 (loopTok->previous()->type() == Token::eIncDecOp)) {
                 return true;
             }
@@ -764,7 +762,7 @@ void CheckBufferOverrun::checkScopeForBody(const Token *tok, const ArrayInfo &ar
     if (!for3(tok2->next(), counter_varid, min_counter_value, max_counter_value, maxMinFlipped))
         return;
 
-    if (Token::Match(tok2->next(), "%var% =|+=|-=") && MathLib::toLongNumber(max_counter_value) <= size)
+    if (Token::Match(tok2->next(), "%var% =") && MathLib::toLongNumber(max_counter_value) <= size)
         condition_out_of_bounds = false;
 
     // Goto the end parenthesis of the for-statement: "for (x; y; z)" ..
diff --git a/lib/checkclass.cpp b/lib/checkclass.cpp
index 27ed19f38..38676b0ca 100644
--- a/lib/checkclass.cpp
+++ b/lib/checkclass.cpp
@@ -997,7 +997,7 @@ void CheckClass::checkReturnPtrThis(const Scope *scope, const Function *func, co
             }
 
             // check if *this is returned
-            else if (!(Token::Match(tok->next(), "(| * this ;|=|+=") ||
+            else if (!(Token::Match(tok->next(), "(| * this ;|=") ||
                        Token::simpleMatch(tok->next(), "operator= (") ||
                        Token::simpleMatch(tok->next(), "this . operator= (") ||
                        (Token::Match(tok->next(), "%type% :: operator= (") &&
diff --git a/lib/checkmemoryleak.cpp b/lib/checkmemoryleak.cpp
index 0664c8542..cccdc77ad 100644
--- a/lib/checkmemoryleak.cpp
+++ b/lib/checkmemoryleak.cpp
@@ -1251,8 +1251,7 @@ Token *CheckMemoryLeakInFunction::getcode(const Token *tok, std::list<const Toke
             }
             if (Token::Match(tok, "[)=] %varid% [+;)]", varid) ||
                 Token::Match(tok, "%var% + %varid%", varid) ||
-                Token::Match(tok, "%varid% +=|-=", varid) ||
-                Token::Match(tok, "+=|<< %varid% ;", varid) ||
+                Token::Match(tok, "<< %varid% ;", varid) ||
                 Token::Match(tok, "= strcpy|strcat|memmove|memcpy ( %varid% ,", varid) ||
                 Token::Match(tok, "[;{}] %var% [ %varid% ]", varid)) {
                 addtoken(&rettail, tok, "use");
diff --git a/lib/checknullpointer.cpp b/lib/checknullpointer.cpp
index 6e9d731d8..2fbd709a1 100644
--- a/lib/checknullpointer.cpp
+++ b/lib/checknullpointer.cpp
@@ -379,7 +379,7 @@ bool CheckNullPointer::isPointerDeRef(const Token *tok, bool &unknown, const Sym
         ovarid = tok->tokAt(2)->varId();
     else if (Token::Match(tok->tokAt(-2), "%var% ==|!= %var%"))
         ovarid = tok->tokAt(-2)->varId();
-    else if (Token::Match(tok->tokAt(-2), "%var% =|+=|+ %var% )|]|,|;|+"))
+    else if (Token::Match(tok->tokAt(-2), "%var% =|+ %var% )|]|,|;|+"))
         ovarid = tok->tokAt(-2)->varId();
     if (ovarid) {
         const Variable* var = symbolDatabase->getVariableFromVarId(ovarid);
@@ -1168,7 +1168,7 @@ void CheckNullPointer::nullConstantDereference()
                 ovarid = tok->tokAt(2)->varId();
             else if (Token::Match(tok, "%var% ==|!= 0"))
                 ovarid = tok->varId();
-            else if (Token::Match(tok, "%var% =|+=|+ 0 )|]|,|;|+"))
+            else if (Token::Match(tok, "%var% =|+ 0 )|]|,|;|+"))
                 ovarid = tok->varId();
             if (ovarid) {
                 const Variable* var = symbolDatabase->getVariableFromVarId(ovarid);