diff --git a/lexer.c b/lexer.c
index 8e49ab9..67dd48a 100644
--- a/lexer.c
+++ b/lexer.c
@@ -39,7 +39,7 @@ token *lexLine(char *input)
 	return root;
 }
 
-regex_t regNumber, regSymbol, regParenthesis, regSpace;
+regex_t regNumber, regSymbol, regLParenthesis, regRParenthesis, regSpace;
 
 token *lex1Token(char *input, int *i)
 {
@@ -50,7 +50,8 @@ token *lex1Token(char *input, int *i)
 	regcomp(&regNumber, "^[-+]?[[:digit:]]+", REG_EXTENDED);
 	regcomp(&regSymbol, "^[-+/*]", REG_EXTENDED);
 /* за сада подржава само симболе -, +, * и / */
-	regcomp(&regParenthesis, "^[()]", REG_EXTENDED);
+	regcomp(&regLParenthesis, "^(", REG_EXTENDED);
+	regcomp(&regRParenthesis, "^)", REG_EXTENDED);
 
 	const int nmatches = 1;
 	regmatch_t a[nmatches];
@@ -67,9 +68,13 @@ token *lex1Token(char *input, int *i)
 	{
 		result->type = symbolToken;
 	}
-	else if (!regexec(&regParenthesis, input + *i, nmatches, a, 0))
+	else if (!regexec(&regLParenthesis, input + *i, nmatches, a, 0))
 	{
-		result->type = parenthesisToken;
+		result->type = LparenthesisToken;
+	}
+	else if (!regexec(&regRParenthesis, input + *i, nmatches, a, 0))
+	{
+		result->type = RparenthesisToken;
 	}
 	else
 	{
@@ -90,7 +95,8 @@ token *lex1Token(char *input, int *i)
 	regfree(&regSpace);
 	regfree(&regNumber);
 	regfree(&regSymbol);
-	regfree(&regParenthesis);
+	regfree(&regLParenthesis);
+	regfree(&regRParenthesis);
 
 	return result;
 }
diff --git a/lexer.h b/lexer.h
index f55769c..683f4ad 100644
--- a/lexer.h
+++ b/lexer.h
@@ -5,7 +5,8 @@ typedef enum
 	undefinedToken,
 	numberToken,
 	symbolToken,
-	parenthesisToken
+	lParenthesisToken,
+	rParenthesisToken
 } tokenType;
 
 typedef struct _Token