convert pattern to perl convention instead throwing an error.

Author: HugoMario

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("'", "\\'");

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("'", "\\'");