diff --git a/build_wasm.sh b/build_wasm.sh
index 4993d859..38f46ea0 100644
--- a/build_wasm.sh
+++ b/build_wasm.sh
@@ -1,3 +1,3 @@
 rm -rf web/lib/
 mkdir -p web/lib/
-em++ src/main.cpp -fno-rtti -fexceptions -sASYNCIFY_STACK_SIZE=131072 -O3 -sEXPORTED_FUNCTIONS=_pkpy_delete,_pkpy_new_repl,_pkpy_repl_input,_pkpy_repl_last_input_result,_pkpy_new_tvm,_pkpy_tvm_exec_async,_pkpy_tvm_get_state,_pkpy_tvm_read_jsonrpc_request,_pkpy_tvm_reset_state,_pkpy_tvm_terminate,_pkpy_tvm_write_jsonrpc_response,_pkpy_new_vm,_pkpy_vm_add_module,_pkpy_vm_eval,_pkpy_vm_exec,_pkpy_vm_get_global,_pkpy_vm_read_output -sASYNCIFY -sEXPORTED_RUNTIME_METHODS=ccall -sASYNCIFY_IMPORTS=pkpy_tvm_exec_async,pkpy_repl_input -o web/lib/pocketpy.js
\ No newline at end of file
+em++ src/main.cpp -fno-rtti -fexceptions -sASYNCIFY_STACK_SIZE=131072 -O2 -sEXPORTED_FUNCTIONS=_pkpy_delete,_pkpy_new_repl,_pkpy_repl_input,_pkpy_repl_last_input_result,_pkpy_new_tvm,_pkpy_tvm_exec_async,_pkpy_tvm_get_state,_pkpy_tvm_read_jsonrpc_request,_pkpy_tvm_reset_state,_pkpy_tvm_terminate,_pkpy_tvm_write_jsonrpc_response,_pkpy_new_vm,_pkpy_vm_add_module,_pkpy_vm_eval,_pkpy_vm_exec,_pkpy_vm_get_global,_pkpy_vm_read_output -sASYNCIFY -sEXPORTED_RUNTIME_METHODS=ccall -sASYNCIFY_IMPORTS=pkpy_tvm_exec_async,pkpy_repl_input -o web/lib/pocketpy.js
\ No newline at end of file
diff --git a/src/compiler.h b/src/compiler.h
index e3aed30d..c4647469 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -21,6 +21,8 @@ struct Loop {
     Loop(int start) : start(start) {}
 };
 
+enum StringType { NORMAL_STRING, RAW_STRING, F_STRING };
+
 class Compiler {
 public:
     pkpy::unique_ptr<Parser> parser;
@@ -112,13 +114,13 @@ public:
 #define EXPR_ANY() parsePrecedence(PREC_ASSIGNMENT)
     }
 
-    _Str eatStringUntil(char quote) {
+    _Str eatStringUntil(char quote, bool raw) {
         std::vector<char> buff;
         while (true) {
             char c = parser->eatCharIncludeNewLine();
             if (c == quote) break;
             if (c == '\0' || c == '\n') syntaxError("EOL while scanning string literal");
-            if (c == '\\') {
+            if (!raw && c == '\\') {
                 switch (parser->eatCharIncludeNewLine()) {
                     case '"':  buff.push_back('"');  break;
                     case '\'': buff.push_back('\''); break;
@@ -136,9 +138,9 @@ public:
         return _Str(buff.data(), buff.size());
     }
 
-    void eatString(char quote, bool fstr) {
-        _Str s = eatStringUntil(quote);
-        if(fstr){
+    void eatString(char quote, StringType type) {
+        _Str s = eatStringUntil(quote, type == RAW_STRING);
+        if(type == F_STRING){
             parser->setNextToken(TK("@fstr"), vm->PyStr(s));
         }else{
             parser->setNextToken(TK("@str"), vm->PyStr(s));
@@ -191,7 +193,7 @@ public:
             parser->token_start = parser->current_char;
             char c = parser->eatCharIncludeNewLine();
             switch (c) {
-                case '\'': case '"': eatString(c, false); return;
+                case '\'': case '"': eatString(c, NORMAL_STRING); return;
                 case '#': parser->skipLineComment(); break;
                 case '{': parser->setNextToken(TK("{")); return;
                 case '}': parser->setNextToken(TK("}")); return;
@@ -266,9 +268,13 @@ public:
                 }
                 default: {
                     if(c == 'f'){
-                        if(parser->matchChar('\'')) {eatString('\'', true); return;}
-                        if(parser->matchChar('"')) {eatString('"', true); return;}
+                        if(parser->matchChar('\'')) {eatString('\'', F_STRING); return;}
+                        if(parser->matchChar('"')) {eatString('"', F_STRING); return;}
+                    }else if(c == 'r'){
+                        if(parser->matchChar('\'')) {eatString('\'', RAW_STRING); return;}
+                        if(parser->matchChar('"')) {eatString('"', RAW_STRING); return;}
                     }
+
                     if (c >= '0' && c <= '9') {
                         eatNumber();
                         return;
diff --git a/tests/_rawstring.py b/tests/_rawstring.py
new file mode 100644
index 00000000..8ca00e19
--- /dev/null
+++ b/tests/_rawstring.py
@@ -0,0 +1,7 @@
+a = r'1\232\\\13'
+
+assert a == '1\\232\\\\\\13'
+
+b = r'测\试'
+assert len(b) == 3
+assert b == '测\\试'
\ No newline at end of file