diff --git a/sample_files/problem_setting/identical_checker_interactor.cpp b/sample_files/problem_setting/identical_checker_interactor.cpp
index b6f1146..75f1e47 100644
--- a/sample_files/problem_setting/identical_checker_interactor.cpp
+++ b/sample_files/problem_setting/identical_checker_interactor.cpp
@@ -106,7 +106,7 @@ long long readInt(long long lo, long long hi) {
 
 long double readFloat(long double min, long double max,
                       long double eps = 1e-9) {
-  static regex_t re = regex_helpers::compile("^-?(0|[1-9][0-9])(\\.[0-9]+)?$");
+  static regex_t re = regex_helpers::compile("^-?(0|[1-9][0-9]*)(\\.[0-9]+)?$");
   std::string token = readToken();
   assertWA(regex_helpers::match(re, token));
   long double parsedDouble;
diff --git a/sample_files/problem_setting/standard_checker_interactor.cpp b/sample_files/problem_setting/standard_checker_interactor.cpp
index 4a20f36..f69b104 100644
--- a/sample_files/problem_setting/standard_checker_interactor.cpp
+++ b/sample_files/problem_setting/standard_checker_interactor.cpp
@@ -149,7 +149,7 @@ long long readInt(long long lo, long long hi) {
 
 long double readFloat(long double min, long double max,
                       long double eps = 1e-9) {
-  static regex_t re = regex_helpers::compile("^-?(0|[1-9][0-9])(\\.[0-9]+)?$");
+  static regex_t re = regex_helpers::compile("^-?(0|[1-9][0-9]*)(\\.[0-9]+)?$");
   std::string token = readToken();
   assertWA(regex_helpers::match(re, token));
   long double parsedDouble;
diff --git a/sample_files/problem_setting/test/testsuite/identical_checker_interactor/cases/basic2/code b/sample_files/problem_setting/test/testsuite/identical_checker_interactor/cases/basic2/code
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/sample_files/problem_setting/test/testsuite/identical_checker_interactor/cases/basic2/code
@@ -0,0 +1 @@
+0
diff --git a/sample_files/problem_setting/test/testsuite/identical_checker_interactor/cases/basic2/input b/sample_files/problem_setting/test/testsuite/identical_checker_interactor/cases/basic2/input
new file mode 100644
index 0000000..be99f0d
--- /dev/null
+++ b/sample_files/problem_setting/test/testsuite/identical_checker_interactor/cases/basic2/input
@@ -0,0 +1,2 @@
+1
+1.76
diff --git a/sample_files/problem_setting/test/testsuite/identical_checker_interactor/cases/basic2/output b/sample_files/problem_setting/test/testsuite/identical_checker_interactor/cases/basic2/output
new file mode 100644
index 0000000..9242d8e
--- /dev/null
+++ b/sample_files/problem_setting/test/testsuite/identical_checker_interactor/cases/basic2/output
@@ -0,0 +1 @@
+1.76
diff --git a/sample_files/problem_setting/validator.cpp b/sample_files/problem_setting/validator.cpp
index 75e6362..d11cf24 100644
--- a/sample_files/problem_setting/validator.cpp
+++ b/sample_files/problem_setting/validator.cpp
@@ -64,7 +64,7 @@ long long readInt(long long lo, long long hi) {
 
 long double readFloat(long double min, long double max,
                       long double eps = 1e-9) {
-  static regex_t re = regex_helpers::compile("^-?(0|[1-9][0-9])(\\.[0-9]+)?$");
+  static regex_t re = regex_helpers::compile("^-?(0|[1-9][0-9]*)(\\.[0-9]+)?$");
   std::string token = readToken();
   assert(regex_helpers::match(re, token));
   long double parsedDouble = stold(token); // May throw.