diff --git a/src/lexer.l b/src/lexer.l
index 41a34e6..0b52e2a 100644
--- a/src/lexer.l
+++ b/src/lexer.l
@@ -1,7 +1,7 @@
 %option c++
 %option noyywrap
 %option yyclass="Scanner"
-%x STRING
+%x STRING_DQ STRING_SQ STRING_TDQ STRING_TSQ
 
 %{
 #include "scanner.hpp"
@@ -21,7 +21,6 @@
     if (action == IndentAction::Dedent) return yy::parser::token::TOK_DEDENT;
 }
 
-
 \n                      { return yy::parser::token::TOK_NEWLINE; }
 
 def                     { return yy::parser::token::TOK_KW_DEF; }
@@ -53,10 +52,27 @@ in                      { return yy::parser::token::TOK_KW_IN; }
 \:                      { return yy::parser::token::TOK_COLON; }
 \;                      { return yy::parser::token::TOK_SEMICOLON; }
 
-\"                      { yymore(); BEGIN(STRING); }
-<STRING>\"              { BEGIN(INITIAL); yylval->as<std::string>() = yytext; return yy::parser::token::TOK_STRING; }
-<STRING>.               { yymore(); }
+\"\"\"                  { yymore(); BEGIN(STRING_TDQ); }
+<STRING_TDQ>\"\"\"      { BEGIN(INITIAL); yylval->as<std::string>() = yytext; return yy::parser::token::TOK_STRING; }
+<STRING_TDQ>.           { yymore(); }
 
+\'\'\'                  { yymore(); BEGIN(STRING_TSQ); }
+<STRING_TSQ>\'\'\'      { BEGIN(INITIAL); yylval->as<std::string>() = yytext; return yy::parser::token::TOK_STRING; }
+<STRING_TSQ>.           { yymore(); }
+
+\"                      { yymore(); BEGIN(STRING_DQ); }
+<STRING_DQ>\\\"         { yymore(); }
+<STRING_DQ>\"           { BEGIN(INITIAL); yylval->as<std::string>() = yytext; return yy::parser::token::TOK_STRING; }
+<STRING_DQ>.            { yymore(); }
+
+\'                      { yymore(); BEGIN(STRING_SQ); }
+<STRING_SQ>\\\'         { yymore(); }
+<STRING_SQ>\'           { BEGIN(INITIAL); yylval->as<std::string>() = yytext; return yy::parser::token::TOK_STRING; }
+<STRING_SQ>.            { yymore(); }
+
+[0-9]+\.[0-9]+          { yylval->as<std::string>() = yytext; return yy::parser::token::TOK_NUMBER; }
+0x[0-9a-fA-F]+          { yylval->as<std::string>() = yytext; return yy::parser::token::TOK_NUMBER; }
+0b[01]+                 { yylval->as<std::string>() = yytext; return yy::parser::token::TOK_NUMBER; }
 [0-9]+                  { yylval->as<std::string>() = yytext; return yy::parser::token::TOK_NUMBER; }
 [A-Za-z_][A-Za-z0-9_]*  { yylval->as<std::string>() = yytext; return yy::parser::token::TOK_IDENTIFIER; }
 
diff --git a/test/lexer/05.out b/test/lexer/05.out
index 2bd6e3a..e1dcf04 100644
--- a/test/lexer/05.out
+++ b/test/lexer/05.out
@@ -10,4 +10,4 @@ NEWLINE
 STRING 'test'
 STRING "escaped\"quote"
 NEWLINE
-EOF
+EOF
\ No newline at end of file