diff --git a/Makefile b/Makefile
index 8218f5b..2ed97e2 100644
--- a/Makefile
+++ b/Makefile
@@ -1,18 +1,22 @@
-
-SQUIRREL=.
-MAKE=make
-
-sq32:
-	cd squirrel; $(MAKE) 
-	cd sqstdlib; $(MAKE) 
-	cd sq; $(MAKE) 
-
-sqprof:
-	cd squirrel; $(MAKE) sqprof
-	cd sqstdlib; $(MAKE) sqprof
-	cd sq; $(MAKE) sqprof
-
-sq64:
-	cd squirrel; $(MAKE) sq64
-	cd sqstdlib; $(MAKE) sq64
-	cd sq; $(MAKE) sq64
+
+SQUIRREL=.
+MAKE=make
+
+sq32: folders
+	cd squirrel; $(MAKE)
+	cd sqstdlib; $(MAKE)
+	cd sq; $(MAKE)
+
+sqprof: folders
+	cd squirrel; $(MAKE) sqprof
+	cd sqstdlib; $(MAKE) sqprof
+	cd sq; $(MAKE) sqprof
+
+sq64: folders
+	cd squirrel; $(MAKE) sq64
+	cd sqstdlib; $(MAKE) sq64
+	cd sq; $(MAKE) sq64
+
+folders:
+	mkdir -p lib
+	mkdir -p bin
diff --git a/samples/regex.nut b/samples/regex.nut
new file mode 100644
index 0000000..fcd8e59
--- /dev/null
+++ b/samples/regex.nut
@@ -0,0 +1,10 @@
+local ex = regexp("[a-zA-Z]+");
+local string = "123 Test; strlen(str);";
+local res = ex.search(string);
+print(string.slice(res.begin,res.end)); //prints "Test"
+print("\n");
+ex = regexp(@"\m()");
+string = "123 Test; doSomething(str, getTemp(), (a+(b/c)));";
+res = ex.search(string);
+print(string.slice(res.begin,res.end)); //prints "(...)"
+print("\n");
diff --git a/sqstdlib/sqstdrex.cpp b/sqstdlib/sqstdrex.cpp
index 2f91792..143516a 100644
--- a/sqstdlib/sqstdrex.cpp
+++ b/sqstdlib/sqstdrex.cpp
@@ -13,7 +13,7 @@ static const SQChar *g_nnames[] =
 	_SC("NONE"),_SC("OP_GREEDY"),	_SC("OP_OR"),
 	_SC("OP_EXPR"),_SC("OP_NOCAPEXPR"),_SC("OP_DOT"),	_SC("OP_CLASS"),
 	_SC("OP_CCLASS"),_SC("OP_NCLASS"),_SC("OP_RANGE"),_SC("OP_CHAR"),
-	_SC("OP_EOL"),_SC("OP_BOL"),_SC("OP_WB")
+	_SC("OP_EOL"),_SC("OP_BOL"),_SC("OP_WB"),_C("OP_MB")
 };
 
 #endif
@@ -31,6 +31,7 @@ static const SQChar *g_nnames[] =
 #define OP_EOL			(MAX_CHAR+11)
 #define OP_BOL			(MAX_CHAR+12)
 #define OP_WB			(MAX_CHAR+13)
+#define OP_MB           (MAX_CHAR+14) //match balanced
 
 #define SQREX_SYMBOL_ANY_CHAR ('.')
 #define SQREX_SYMBOL_GREEDY_ONE_OR_MORE ('+')
@@ -139,7 +140,20 @@ static SQInteger sqstd_rex_charnode(SQRex *exp,SQBool isclass)
 				t = *exp->_p; exp->_p++; 
 				return sqstd_rex_charclass(exp,t);
 				}
-			case 'b': 
+            case 'm':
+                {
+                     SQChar cb, ce; //cb = character begin match ce = character end match
+                     cb = *++exp->_p; //skip 'm'
+                     ce = *++exp->_p;
+                     exp->_p++; //points to the next char to be parsed
+                     if ((!cb) || (!ce)) sqstd_rex_error(exp,_SC("balanced chars expected"));
+                     if ( cb == ce ) sqstd_rex_error(exp,_SC("open/close char can't be the same"));
+                     SQInteger node =  sqstd_rex_newnode(exp,OP_MB);
+                     exp->_nodes[node].left = cb;
+                     exp->_nodes[node].right = ce;
+                     return node;
+                }
+			case 'b':
 			case 'B':
 				if(!isclass) {
 					SQInteger node = sqstd_rex_newnode(exp,OP_WB);
@@ -199,8 +213,6 @@ static SQInteger sqstd_rex_class(SQRex *exp)
 	if(first!=-1){
 		SQInteger c = first;
 		exp->_nodes[chain].next = c;
-		chain = c;
-		first = -1;
 	}
 	/* hack? */
 	exp->_nodes[ret].left = exp->_nodes[ret].next;
@@ -506,6 +518,23 @@ static const SQChar *sqstd_rex_matchnode(SQRex* exp,SQRexNode *node,const SQChar
 			return str;
 		}
 		return NULL;
+    case OP_MB:
+        {
+            int cb = node->left; //char that opens a balanced expression
+            if(*str != cb) return NULL; // string doesnt start with open char
+            int ce = node->right; //char that closes a balanced expression
+            int cont = 1;
+            const SQChar *strEol = exp->_eol;
+            while (++str < strEol) {
+              if (*str == ce) {
+                if (--cont == 0) {
+                    return ++str;
+                }
+              }
+              else if (*str == cb) cont++;
+            }
+        }
+        return NULL; // string ends out of balance
 	default: /* char */
 		if(*str != node->type) return NULL;
 		str++;
diff --git a/sqstdlib/sqstdstring.cpp b/sqstdlib/sqstdstring.cpp
index 4e3160f..5b43bc9 100644
--- a/sqstdlib/sqstdstring.cpp
+++ b/sqstdlib/sqstdstring.cpp
@@ -71,7 +71,7 @@ SQRESULT sqstd_format(HSQUIRRELVM v,SQInteger nformatstringidx,SQInteger *outlen
 	SQChar fmt[MAX_FORMAT_LEN];
 	sq_getstring(v,nformatstringidx,&format);
 	SQInteger format_size = sq_getsize(v,nformatstringidx); 
-	SQInteger allocated = (sq_getsize(v,nformatstringidx)+2)*sizeof(SQChar);
+	SQInteger allocated = (format_size+2)*sizeof(SQChar);
 	dest = sq_getscratchpad(v,allocated);
 	SQInteger n = 0,i = 0, nparam = nformatstringidx+1, w = 0;
 	//while(format[n] != '\0') 
diff --git a/squirrel/sqapi.cpp b/squirrel/sqapi.cpp
index 93c86b0..413b04c 100644
--- a/squirrel/sqapi.cpp
+++ b/squirrel/sqapi.cpp
@@ -34,7 +34,8 @@ static bool sq_aux_gettypedarg(HSQUIRRELVM v,SQInteger idx,SQObjectType type,SQO
 
 SQInteger sq_aux_invalidtype(HSQUIRRELVM v,SQObjectType type)
 {
-	scsprintf(_ss(v)->GetScratchPad(100), 100 *sizeof(SQChar), _SC("unexpected type %s"), IdType2Name(type));
+	SQUnsignedInteger buf_size = 100 *sizeof(SQChar);
+	scsprintf(_ss(v)->GetScratchPad(buf_size), buf_size, _SC("unexpected type %s"), IdType2Name(type));
 	return sq_throwerror(v, _ss(v)->GetScratchPad(-1));
 }
 
@@ -454,6 +455,7 @@ SQRESULT sq_bindenv(HSQUIRRELVM v,SQInteger idx)
 		return sq_throwerror(v,_SC("the target is not a closure"));
     SQObjectPtr &env = stack_get(v,-1);
 	if(!sq_istable(env) &&
+		!sq_isarray(env) &&
 		!sq_isclass(env) &&
 		!sq_isinstance(env))
 		return sq_throwerror(v,_SC("invalid environment"));
@@ -891,29 +893,30 @@ SQRESULT sq_set(HSQUIRRELVM v,SQInteger idx)
 SQRESULT sq_rawset(HSQUIRRELVM v,SQInteger idx)
 {
 	SQObjectPtr &self = stack_get(v, idx);
-	if(type(v->GetUp(-2)) == OT_NULL) {
+	SQObjectPtr &key = v->GetUp(-2);
+	if(type(key) == OT_NULL) {
 		v->Pop(2);
 		return sq_throwerror(v, _SC("null key"));
 	}
 	switch(type(self)) {
 	case OT_TABLE:
-		_table(self)->NewSlot(v->GetUp(-2), v->GetUp(-1));
+		_table(self)->NewSlot(key, v->GetUp(-1));
 		v->Pop(2);
 		return SQ_OK;
 	break;
 	case OT_CLASS:
-		_class(self)->NewSlot(_ss(v), v->GetUp(-2), v->GetUp(-1),false);
+		_class(self)->NewSlot(_ss(v), key, v->GetUp(-1),false);
 		v->Pop(2);
 		return SQ_OK;
 	break;
 	case OT_INSTANCE:
-		if(_instance(self)->Set(v->GetUp(-2), v->GetUp(-1))) {
+		if(_instance(self)->Set(key, v->GetUp(-1))) {
 			v->Pop(2);
 			return SQ_OK;
 		}
 	break;
 	case OT_ARRAY:
-		if(v->Set(self, v->GetUp(-2), v->GetUp(-1),false)) {
+		if(v->Set(self, key, v->GetUp(-1),false)) {
 			v->Pop(2);
 			return SQ_OK;
 		}
@@ -929,8 +932,9 @@ SQRESULT sq_newmember(HSQUIRRELVM v,SQInteger idx,SQBool bstatic)
 {
 	SQObjectPtr &self = stack_get(v, idx);
 	if(type(self) != OT_CLASS) return sq_throwerror(v, _SC("new member only works with classes"));
-	if(type(v->GetUp(-3)) == OT_NULL) return sq_throwerror(v, _SC("null key"));
-	if(!v->NewSlotA(self,v->GetUp(-3),v->GetUp(-2),v->GetUp(-1),bstatic?true:false,false))
+	SQObjectPtr &key = v->GetUp(-3);
+	if(type(key) == OT_NULL) return sq_throwerror(v, _SC("null key"));
+	if(!v->NewSlotA(self,key,v->GetUp(-2),v->GetUp(-1),bstatic?true:false,false))
 		return SQ_ERROR;
 	return SQ_OK; 
 }
@@ -939,8 +943,9 @@ SQRESULT sq_rawnewmember(HSQUIRRELVM v,SQInteger idx,SQBool bstatic)
 {
 	SQObjectPtr &self = stack_get(v, idx);
 	if(type(self) != OT_CLASS) return sq_throwerror(v, _SC("new member only works with classes"));
-	if(type(v->GetUp(-3)) == OT_NULL) return sq_throwerror(v, _SC("null key"));
-	if(!v->NewSlotA(self,v->GetUp(-3),v->GetUp(-2),v->GetUp(-1),bstatic?true:false,true))
+	SQObjectPtr &key = v->GetUp(-3);
+	if(type(key) == OT_NULL) return sq_throwerror(v, _SC("null key"));
+	if(!v->NewSlotA(self,key,v->GetUp(-2),v->GetUp(-1),bstatic?true:false,true))
 		return SQ_ERROR;
 	return SQ_OK; 
 }
@@ -1010,7 +1015,8 @@ SQRESULT sq_getdelegate(HSQUIRRELVM v,SQInteger idx)
 SQRESULT sq_get(HSQUIRRELVM v,SQInteger idx)
 {
 	SQObjectPtr &self=stack_get(v,idx);
-	if(v->Get(self,v->GetUp(-1),v->GetUp(-1),0,DONT_FALL_BACK))
+	SQObjectPtr &obj = v->GetUp(-1);
+	if(v->Get(self,obj,obj,false,DONT_FALL_BACK))
 		return SQ_OK;
 	v->Pop();
 	return SQ_ERROR;
@@ -1019,23 +1025,23 @@ SQRESULT sq_get(HSQUIRRELVM v,SQInteger idx)
 SQRESULT sq_rawget(HSQUIRRELVM v,SQInteger idx)
 {
 	SQObjectPtr &self=stack_get(v,idx);
+	SQObjectPtr &obj = v->GetUp(-1);
 	switch(type(self)) {
 	case OT_TABLE:
-		if(_table(self)->Get(v->GetUp(-1),v->GetUp(-1)))
+		if(_table(self)->Get(obj,obj))
 			return SQ_OK;
 		break;
 	case OT_CLASS:
-		if(_class(self)->Get(v->GetUp(-1),v->GetUp(-1)))
+		if(_class(self)->Get(obj,obj))
 			return SQ_OK;
 		break;
 	case OT_INSTANCE:
-		if(_instance(self)->Get(v->GetUp(-1),v->GetUp(-1)))
+		if(_instance(self)->Get(obj,obj))
 			return SQ_OK;
 		break;
 	case OT_ARRAY:{
-		SQObjectPtr& key = v->GetUp(-1);
-		if(sq_isnumeric(key)){
-			if(_array(self)->Get(tointeger(key),v->GetUp(-1))) {
+		if(sq_isnumeric(obj)){
+			if(_array(self)->Get(tointeger(obj),obj)) {
 				return SQ_OK;
 			}
 		}
@@ -1048,7 +1054,7 @@ SQRESULT sq_rawget(HSQUIRRELVM v,SQInteger idx)
 	default:
 		v->Pop();
 		return sq_throwerror(v,_SC("rawget works only on array/table/instance and class"));
-	}	
+	}
 	v->Pop();
 	return sq_throwerror(v,_SC("the index doesn't exist"));
 }
@@ -1131,9 +1137,10 @@ SQRESULT sq_reservestack(HSQUIRRELVM v,SQInteger nsize)
 
 SQRESULT sq_resume(HSQUIRRELVM v,SQBool retval,SQBool raiseerror)
 {
-	if(type(v->GetUp(-1))==OT_GENERATOR){
+    SQObjectPtr &obj = v->GetUp(-1);
+	if(type(obj)==OT_GENERATOR){
 		v->PushNull(); //retval
-		if(!v->Execute(v->GetUp(-2),0,v->_top,v->GetUp(-1),raiseerror,SQVM::ET_RESUME_GENERATOR))
+		if(!v->Execute(v->GetUp(-2),0,v->_top,obj,raiseerror,SQVM::ET_RESUME_GENERATOR))
 		{v->Raise_Error(v->_lasterror); return SQ_ERROR;}
 		if(!retval)
 			v->Pop();