diff --git a/quafu/qfasm/qfasm_lexer.py b/quafu/qfasm/qfasm_lexer.py
index 6b49ef1..c37f9c3 100644
--- a/quafu/qfasm/qfasm_lexer.py
+++ b/quafu/qfasm/qfasm_lexer.py
@@ -127,7 +127,7 @@ def t_INCLUDE(self, _):
         return self.lexer.token()
 
     def t_FLOAT(self, t):
-        r"(([1-9]\d*\.\d*)|(0\.\d*[1-9]\d*))"
+        r"([0-9]\d*\.\d*)"
         t.value = float(t.value)
         return t