feat: Add regex UI validation (#514)

Author: arya-girish-k

ibm_catalog.json

@@ -280,10 +280,24 @@
               "description": "The pricing plan to use when provisioning a Secrets Manager instance. Possible values: `standard`, `trial`. You can create only one Trial instance of Secrets Manager per account. Before you can create a new Trial instance, you must delete the existing Trial instance and its reclamation. [Learn more](https://cloud.ibm.com/docs/secrets-manager?topic=secrets-manager-create-instance&interface=ui#upgrade-instance-standard)."
             },
             {
-              "key": "existing_secrets_manager_instance_crn"
+              "key": "existing_secrets_manager_instance_crn",
+              "value_constraints": [
+                {
+                  "type": "regex",
+                  "description": "The value provided for 'existing_secrets_manager_instance_crn' is not valid.",
+                  "value": "^crn:(.*:){3}secrets-manager:(.*:){2}[0-9a-fA-F]{8}(?:-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}::$"
+                }
+              ]
             },
             {
-              "key": "existing_secrets_manager_cert_crn"
+              "key": "existing_secrets_manager_cert_crn",
+              "value_constraints": [
+                {
+                  "type": "regex",
+                  "description": "The value provided for 'existing_secrets_manager_cert_crn' is not valid.",
+                  "value": "^__NULL__$|^crn:(.*:){3}secrets-manager:(.*:){2}[0-9a-fA-F]{8}(?:-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}:secret:[0-9a-fA-F]{8}(?:-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}$"
+                }
+              ]
             },
             {
               "key": "root_ca_name",
@@ -411,7 +425,14 @@
               "key": "vpn_route_action"
             },
             {
-              "key": "existing_vpc_crn"
+              "key": "existing_vpc_crn",
+              "value_constraints": [
+                {
+                  "type": "regex",
+                  "description": "The value provided for 'existing_vpc_crn' is not valid.",
+                  "value": "^crn:(.*:){3}is:(.*:){2}:vpc:[0-9a-z]{4}-[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$"
+                }
+              ]
             },
             {
               "key": "vpn_zone_1"