diff --git a/backend/src/lexer.cpp b/backend/src/lexer.cpp
index 8980500..3950bc7 100644
--- a/backend/src/lexer.cpp
+++ b/backend/src/lexer.cpp
@@ -337,7 +337,7 @@ bool CommandModifyLexer(const std::string &command, std::string &ISBN,
                         std::string &name, std::string &author,
                         std::string &keyword, double &price) {
   static std::basic_regex main_pattern(
-      R"(^ *modify(?: +-ISBN=(?:\S{1,20})| +-name=\"(?:[^\s"]{1,60})\"| +-author=\"(?:[^\s"]{1,60})\"| +-keyword=\"(?:[^\s"]{1,60})\"| +-price=[0-9]{1,10}(?:\.[0-9]{1,2})?)+ *$)",
+      R"(^ *modify(?: +-ISBN=(?:\S{1,20})| +-name=\"(?:[^\s"]{1,60})\"| +-author=\"(?:[^\s"]{1,60})\"| +-keyword=\"(?:[^\s"]{1,60})\"| +-price=[0-9]{1,10}(?:\.[0-9]+)?)+ *$)",
       std::regex_constants::optimize);
   if (std::regex_match(command, main_pattern)) {
     std::stringstream ss(command);
@@ -385,7 +385,7 @@ bool CommandModifyLexer(const std::string &command, std::string &ISBN,
 bool CommandImportLexer(const std::string &command, int &quantity,
                         double &total_cost) {
   static std::basic_regex main_pattern(
-      R"(^ *import +[0-9]{1,10} +[0-9]{1,10}(?:\.[0-9]{1,2})? *$)",
+      R"(^ *import +[0-9]{1,10} +[0-9]{1,10}(?:\.[0-9]+)? *$)",
       std::regex_constants::optimize);
   if (std::regex_match(command, main_pattern)) {
     std::stringstream ss(command);