diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/FlaskConnexionCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/FlaskConnexionCodegen.java
index 612d7f37e89..2779a09386a 100755
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/FlaskConnexionCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/FlaskConnexionCodegen.java
@@ -688,10 +688,8 @@ public void postProcessPattern(String pattern, Map<String, Object> vendorExtensi
         if(pattern != null) {
             int i = pattern.lastIndexOf('/');
 
-            //Must follow Perl /pattern/modifiers convention
             if(pattern.charAt(0) != '/' || i < 2) {
-                throw new IllegalArgumentException("Pattern must follow the Perl "
-                        + "/pattern/modifiers convention. "+pattern+" is not valid.");
+                pattern = String.format("/%s/", pattern);
             }
 
             String regex = pattern.substring(1, i).replace("'", "\\'");
diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PythonClientCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PythonClientCodegen.java
index 7a8149a6e78..f5f5e63466b 100755
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PythonClientCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PythonClientCodegen.java
@@ -265,10 +265,8 @@ public void postProcessPattern(String pattern, Map<String, Object> vendorExtensi
         if(pattern != null) {
             int i = pattern.lastIndexOf('/');
 
-            //Must follow Perl /pattern/modifiers convention
             if(pattern.charAt(0) != '/' || i < 2) {
-                throw new IllegalArgumentException("Pattern must follow the Perl "
-                        + "/pattern/modifiers convention. "+pattern+" is not valid.");
+                pattern = String.format("/%s/", pattern);
             }
 
             String regex = pattern.substring(1, i).replace("'", "\\'");