[PLAT-14900] Exclude empty string from regex validation for AZUoption…

…al fields

Summary:
The optional resource group fields for AZU providers have regex pattern
validation.
Since this field is option, we should be ignoring the field when it is
empty.

Test Plan:
Verify with a name that fails the regex pattern validation (ex.
`resourceGroup.`). An error message is expected.
Verify with a name that passes the regex pattern validation (ex.
`resourceGroup`). No error message is expected.
Verify with no input in the optional resource group fields. No error message
is expected.

Reviewers: lsangappa, yshchetinin, rmadhavan

Reviewed By: lsangappa

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D37249

managed/ui/src/components/configRedesign/providerRedesign/forms/configureRegion/ConfigureRegionModal.tsx

@@ -184,15 +184,19 @@ export const ConfigureRegionModal = ({
     }),
     azuNetworkRGOverride: string().when([], {
       is: () => shouldExposeField.azuNetworkRGOverride && providerCode === ProviderCode.AZU,
-      then: string().matches(
-          RG_REGEX,
-          "Resource group names can only include alphanumeric, underscore, parentheses, hyphen, period (except at end)"),
+      then: string().matches(RG_REGEX, {
+        message:
+          'Resource group names can only include alphanumeric, underscore, parentheses, hyphen, period (except at end)',
+        excludeEmptyString: true
+      })
     }),
     azuRGOverride: string().when([], {
       is: () => shouldExposeField.azuRGOverride && providerCode === ProviderCode.AZU,
-      then: string().matches(
-          RG_REGEX,
-          "Resource group names can only include alphanumeric, underscore, parentheses, hyphen, period (except at end)"),
+      then: string().matches(RG_REGEX, {
+        message:
+          'Resource group names can only include alphanumeric, underscore, parentheses, hyphen, period (except at end)',
+        excludeEmptyString: true
+      })
     })
   });
   const formMethods = useForm<ConfigureRegionFormValues>({