Fixes python regex flags

Author: spacether

modules/openapi-json-schema-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java

@@ -1041,7 +1041,9 @@ public CodegenProperty fromProperty(String name, Schema p, boolean required, boo
             cp.isNullable = false;
             cp.setHasMultipleTypes(true);
         }
-        postProcessPattern(cp.pattern, cp.vendorExtensions);
+        if (p.getPattern() != null) {
+            postProcessPattern(p.getPattern(), cp.vendorExtensions);
+        }
         // if we have a property that has a difficult name, either:
         // 1. name is reserved, like class int float
         // 2. name is invalid in python like '3rd' or 'Content-Type'

samples/openapi3/client/petstore/python/petstore_api/model/apple.py

@@ -63,6 +63,9 @@ class origin(
                 class MetaOapg:
                     regex=[{
                         'pattern': r'^[A-Z\s]*$',  # noqa: E501
+                        'flags': (
+                            re.IGNORECASE
+                        )
                     }]
             __annotations__ = {
                 "cultivar": cultivar,

samples/openapi3/client/petstore/python/petstore_api/model/format_test.py

@@ -148,6 +148,9 @@ class string(
                 class MetaOapg:
                     regex=[{
                         'pattern': r'[a-z]',  # noqa: E501
+                        'flags': (
+                            re.IGNORECASE
+                        )
                     }]
             binary = schemas.BinarySchema
             dateTime = schemas.DateTimeSchema
@@ -174,6 +177,9 @@ class pattern_with_digits_and_delimiter(
                 class MetaOapg:
                     regex=[{
                         'pattern': r'^image_\d{1,3}$',  # noqa: E501
+                        'flags': (
+                            re.IGNORECASE
+                        )
                     }]
             noneProp = schemas.NoneSchema
             __annotations__ = {

samples/openapi3/client/petstore/python/petstore_api/paths/fake/post.py

@@ -107,6 +107,9 @@ class string(
                 class MetaOapg:
                     regex=[{
                         'pattern': r'[a-z]',  # noqa: E501
+                        'flags': (
+                            re.IGNORECASE
+                        )
                     }]