diff --git a/modules/openapi-generator/src/main/resources/ruby-client/api_client.mustache b/modules/openapi-generator/src/main/resources/ruby-client/api_client.mustache
index cb9205691b6d..89fbba0e0865 100644
--- a/modules/openapi-generator/src/main/resources/ruby-client/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/ruby-client/api_client.mustache
@@ -64,7 +64,7 @@ module {{moduleName}}
     # @param [String] mime MIME
     # @return [Boolean] True if the MIME is application/json
     def json_mime?(mime)
-      (mime == '*/*') || !(mime =~ /Application\/.*json(?!p)(;.*)?/i).nil?
+      (mime == '*/*') || !(mime =~ /^Application\/.*json(?!p)(;.*)?/i).nil?
     end
 
     # Deserialize the response to the given return type.
@@ -143,7 +143,7 @@ module {{moduleName}}
     # @param [String] filename the filename to be sanitized
     # @return [String] the sanitized filename
     def sanitize_filename(filename)
-      filename.gsub(/.*[\/\\]/, '')
+      filename.split(/[\/\\]/).last
     end
 
     def build_request_url(path, opts = {})
diff --git a/samples/client/echo_api/ruby-faraday/lib/openapi_client/api_client.rb b/samples/client/echo_api/ruby-faraday/lib/openapi_client/api_client.rb
index 89a64fea22be..5b05ebbda795 100644
--- a/samples/client/echo_api/ruby-faraday/lib/openapi_client/api_client.rb
+++ b/samples/client/echo_api/ruby-faraday/lib/openapi_client/api_client.rb
@@ -249,7 +249,7 @@ module OpenapiClient
     # @param [String] mime MIME
     # @return [Boolean] True if the MIME is application/json
     def json_mime?(mime)
-      (mime == '*/*') || !(mime =~ /Application\/.*json(?!p)(;.*)?/i).nil?
+      (mime == '*/*') || !(mime =~ /^Application\/.*json(?!p)(;.*)?/i).nil?
     end
 
     # Deserialize the response to the given return type.
@@ -328,7 +328,7 @@ module OpenapiClient
     # @param [String] filename the filename to be sanitized
     # @return [String] the sanitized filename
     def sanitize_filename(filename)
-      filename.gsub(/.*[\/\\]/, '')
+      filename.split(/[\/\\]/).last
     end
 
     def build_request_url(path, opts = {})
diff --git a/samples/client/echo_api/ruby-httpx/lib/openapi_client/api_client.rb b/samples/client/echo_api/ruby-httpx/lib/openapi_client/api_client.rb
index f6c10b6c37e3..b6263b3b6e7d 100644
--- a/samples/client/echo_api/ruby-httpx/lib/openapi_client/api_client.rb
+++ b/samples/client/echo_api/ruby-httpx/lib/openapi_client/api_client.rb
@@ -188,7 +188,7 @@ module OpenapiClient
     # @param [String] mime MIME
     # @return [Boolean] True if the MIME is application/json
     def json_mime?(mime)
-      (mime == '*/*') || !(mime =~ /Application\/.*json(?!p)(;.*)?/i).nil?
+      (mime == '*/*') || !(mime =~ /^Application\/.*json(?!p)(;.*)?/i).nil?
     end
 
     # Deserialize the response to the given return type.
@@ -267,7 +267,7 @@ module OpenapiClient
     # @param [String] filename the filename to be sanitized
     # @return [String] the sanitized filename
     def sanitize_filename(filename)
-      filename.gsub(/.*[\/\\]/, '')
+      filename.split(/[\/\\]/).last
     end
 
     def build_request_url(path, opts = {})
diff --git a/samples/client/echo_api/ruby-typhoeus/lib/openapi_client/api_client.rb b/samples/client/echo_api/ruby-typhoeus/lib/openapi_client/api_client.rb
index 7fdd2f107b8b..a632a77706dc 100644
--- a/samples/client/echo_api/ruby-typhoeus/lib/openapi_client/api_client.rb
+++ b/samples/client/echo_api/ruby-typhoeus/lib/openapi_client/api_client.rb
@@ -212,7 +212,7 @@ module OpenapiClient
     # @param [String] mime MIME
     # @return [Boolean] True if the MIME is application/json
     def json_mime?(mime)
-      (mime == '*/*') || !(mime =~ /Application\/.*json(?!p)(;.*)?/i).nil?
+      (mime == '*/*') || !(mime =~ /^Application\/.*json(?!p)(;.*)?/i).nil?
     end
 
     # Deserialize the response to the given return type.
@@ -291,7 +291,7 @@ module OpenapiClient
     # @param [String] filename the filename to be sanitized
     # @return [String] the sanitized filename
     def sanitize_filename(filename)
-      filename.gsub(/.*[\/\\]/, '')
+      filename.split(/[\/\\]/).last
     end
 
     def build_request_url(path, opts = {})
diff --git a/samples/client/petstore/ruby-autoload/lib/petstore/api_client.rb b/samples/client/petstore/ruby-autoload/lib/petstore/api_client.rb
index 458af361cbad..872c7ed9ed89 100644
--- a/samples/client/petstore/ruby-autoload/lib/petstore/api_client.rb
+++ b/samples/client/petstore/ruby-autoload/lib/petstore/api_client.rb
@@ -212,7 +212,7 @@ module Petstore
     # @param [String] mime MIME
     # @return [Boolean] True if the MIME is application/json
     def json_mime?(mime)
-      (mime == '*/*') || !(mime =~ /Application\/.*json(?!p)(;.*)?/i).nil?
+      (mime == '*/*') || !(mime =~ /^Application\/.*json(?!p)(;.*)?/i).nil?
     end
 
     # Deserialize the response to the given return type.
@@ -291,7 +291,7 @@ module Petstore
     # @param [String] filename the filename to be sanitized
     # @return [String] the sanitized filename
     def sanitize_filename(filename)
-      filename.gsub(/.*[\/\\]/, '')
+      filename.split(/[\/\\]/).last
     end
 
     def build_request_url(path, opts = {})
diff --git a/samples/client/petstore/ruby-faraday/lib/petstore/api_client.rb b/samples/client/petstore/ruby-faraday/lib/petstore/api_client.rb
index 382b5147b8d2..aa1cbe551b73 100644
--- a/samples/client/petstore/ruby-faraday/lib/petstore/api_client.rb
+++ b/samples/client/petstore/ruby-faraday/lib/petstore/api_client.rb
@@ -249,7 +249,7 @@ module Petstore
     # @param [String] mime MIME
     # @return [Boolean] True if the MIME is application/json
     def json_mime?(mime)
-      (mime == '*/*') || !(mime =~ /Application\/.*json(?!p)(;.*)?/i).nil?
+      (mime == '*/*') || !(mime =~ /^Application\/.*json(?!p)(;.*)?/i).nil?
     end
 
     # Deserialize the response to the given return type.
@@ -328,7 +328,7 @@ module Petstore
     # @param [String] filename the filename to be sanitized
     # @return [String] the sanitized filename
     def sanitize_filename(filename)
-      filename.gsub(/.*[\/\\]/, '')
+      filename.split(/[\/\\]/).last
     end
 
     def build_request_url(path, opts = {})
diff --git a/samples/client/petstore/ruby-httpx/lib/petstore/api_client.rb b/samples/client/petstore/ruby-httpx/lib/petstore/api_client.rb
index 1969c423f157..dccfe9a603e3 100644
--- a/samples/client/petstore/ruby-httpx/lib/petstore/api_client.rb
+++ b/samples/client/petstore/ruby-httpx/lib/petstore/api_client.rb
@@ -188,7 +188,7 @@ module Petstore
     # @param [String] mime MIME
     # @return [Boolean] True if the MIME is application/json
     def json_mime?(mime)
-      (mime == '*/*') || !(mime =~ /Application\/.*json(?!p)(;.*)?/i).nil?
+      (mime == '*/*') || !(mime =~ /^Application\/.*json(?!p)(;.*)?/i).nil?
     end
 
     # Deserialize the response to the given return type.
@@ -267,7 +267,7 @@ module Petstore
     # @param [String] filename the filename to be sanitized
     # @return [String] the sanitized filename
     def sanitize_filename(filename)
-      filename.gsub(/.*[\/\\]/, '')
+      filename.split(/[\/\\]/).last
     end
 
     def build_request_url(path, opts = {})
diff --git a/samples/client/petstore/ruby/lib/petstore/api_client.rb b/samples/client/petstore/ruby/lib/petstore/api_client.rb
index 458af361cbad..872c7ed9ed89 100644
--- a/samples/client/petstore/ruby/lib/petstore/api_client.rb
+++ b/samples/client/petstore/ruby/lib/petstore/api_client.rb
@@ -212,7 +212,7 @@ module Petstore
     # @param [String] mime MIME
     # @return [Boolean] True if the MIME is application/json
     def json_mime?(mime)
-      (mime == '*/*') || !(mime =~ /Application\/.*json(?!p)(;.*)?/i).nil?
+      (mime == '*/*') || !(mime =~ /^Application\/.*json(?!p)(;.*)?/i).nil?
     end
 
     # Deserialize the response to the given return type.
@@ -291,7 +291,7 @@ module Petstore
     # @param [String] filename the filename to be sanitized
     # @return [String] the sanitized filename
     def sanitize_filename(filename)
-      filename.gsub(/.*[\/\\]/, '')
+      filename.split(/[\/\\]/).last
     end
 
     def build_request_url(path, opts = {})
diff --git a/samples/openapi3/client/extensions/x-auth-id-alias/ruby-client/lib/x_auth_id_alias/api_client.rb b/samples/openapi3/client/extensions/x-auth-id-alias/ruby-client/lib/x_auth_id_alias/api_client.rb
index 9553545a7766..d6a7d2f60768 100644
--- a/samples/openapi3/client/extensions/x-auth-id-alias/ruby-client/lib/x_auth_id_alias/api_client.rb
+++ b/samples/openapi3/client/extensions/x-auth-id-alias/ruby-client/lib/x_auth_id_alias/api_client.rb
@@ -212,7 +212,7 @@ module XAuthIDAlias
     # @param [String] mime MIME
     # @return [Boolean] True if the MIME is application/json
     def json_mime?(mime)
-      (mime == '*/*') || !(mime =~ /Application\/.*json(?!p)(;.*)?/i).nil?
+      (mime == '*/*') || !(mime =~ /^Application\/.*json(?!p)(;.*)?/i).nil?
     end
 
     # Deserialize the response to the given return type.
@@ -291,7 +291,7 @@ module XAuthIDAlias
     # @param [String] filename the filename to be sanitized
     # @return [String] the sanitized filename
     def sanitize_filename(filename)
-      filename.gsub(/.*[\/\\]/, '')
+      filename.split(/[\/\\]/).last
     end
 
     def build_request_url(path, opts = {})
diff --git a/samples/openapi3/client/features/dynamic-servers/ruby/lib/dynamic_servers/api_client.rb b/samples/openapi3/client/features/dynamic-servers/ruby/lib/dynamic_servers/api_client.rb
index c1b2ca52f4c0..8e76e817eb1d 100644
--- a/samples/openapi3/client/features/dynamic-servers/ruby/lib/dynamic_servers/api_client.rb
+++ b/samples/openapi3/client/features/dynamic-servers/ruby/lib/dynamic_servers/api_client.rb
@@ -211,7 +211,7 @@ module DynamicServers
     # @param [String] mime MIME
     # @return [Boolean] True if the MIME is application/json
     def json_mime?(mime)
-      (mime == '*/*') || !(mime =~ /Application\/.*json(?!p)(;.*)?/i).nil?
+      (mime == '*/*') || !(mime =~ /^Application\/.*json(?!p)(;.*)?/i).nil?
     end
 
     # Deserialize the response to the given return type.
@@ -290,7 +290,7 @@ module DynamicServers
     # @param [String] filename the filename to be sanitized
     # @return [String] the sanitized filename
     def sanitize_filename(filename)
-      filename.gsub(/.*[\/\\]/, '')
+      filename.split(/[\/\\]/).last
     end
 
     def build_request_url(path, opts = {})
diff --git a/samples/openapi3/client/features/generate-alias-as-model/ruby-client/lib/petstore/api_client.rb b/samples/openapi3/client/features/generate-alias-as-model/ruby-client/lib/petstore/api_client.rb
index 96df340d7e26..82b1e9ea66f7 100644
--- a/samples/openapi3/client/features/generate-alias-as-model/ruby-client/lib/petstore/api_client.rb
+++ b/samples/openapi3/client/features/generate-alias-as-model/ruby-client/lib/petstore/api_client.rb
@@ -211,7 +211,7 @@ module Petstore
     # @param [String] mime MIME
     # @return [Boolean] True if the MIME is application/json
     def json_mime?(mime)
-      (mime == '*/*') || !(mime =~ /Application\/.*json(?!p)(;.*)?/i).nil?
+      (mime == '*/*') || !(mime =~ /^Application\/.*json(?!p)(;.*)?/i).nil?
     end
 
     # Deserialize the response to the given return type.
@@ -290,7 +290,7 @@ module Petstore
     # @param [String] filename the filename to be sanitized
     # @return [String] the sanitized filename
     def sanitize_filename(filename)
-      filename.gsub(/.*[\/\\]/, '')
+      filename.split(/[\/\\]/).last
     end
 
     def build_request_url(path, opts = {})