diff --git a/templates/python/model_generic.mustache b/templates/python/model_generic.mustache
index e6624b8..9da546d 100644
--- a/templates/python/model_generic.mustache
+++ b/templates/python/model_generic.mustache
@@ -41,7 +41,7 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
     def {{{name}}}_validate_regular_expression(cls, value):
         """Validates the regular expression"""
         {{^required}}
-        if value is None:
+        if value is None or value == "":
             return value
 
         {{/required}}