[RDBMS] az postgres flexible-server create/db create: BUG FIX, validation for database name (#31542)

Author: nasc17

src/azure-cli/azure/cli/command_modules/rdbms/_params.py

@@ -267,8 +267,8 @@ def _flexible_server_params(command_group):
             id_part='child_name_1',
             help='The name of the database to be created when provisioning the database server. '
                  'Database name must begin with a letter (a-z) or underscore (_). Subsequent characters '
-                 'in a name can be letters, digits (0-9), or underscores. Database name length must be less '
-                 'than 32 characters.',
+                 'in a name can be letters, digits (0-9), hyphens (-), or underscores. '
+                 'Database name length must be less than 64 characters.',
             local_context_attribute=LocalContextAttribute(
                 name='database_name',
                 actions=[LocalContextAction.SET],

src/azure-cli/azure/cli/command_modules/rdbms/validators.py

@@ -986,7 +986,7 @@ def validate_backup_name(backup_name):
 
 
 def validate_database_name(database_name):
-    if database_name is not None and not re.match(r'^[a-zA-Z_][a-zA-Z0-9_]{0,30}$', database_name):
+    if database_name is not None and not re.match(r'^[a-zA-Z_][\w\-]{0,62}$', database_name):
         raise ValidationError("Database name must begin with a letter (a-z) or underscore (_). "
-                              "Subsequent characters in a name can be letters, digits (0-9), or underscores. "
-                              "Database name length must be less than 32 characters.")
+                              "Subsequent characters in a name can be letters, digits (0-9), hyphens (-), "
+                              "or underscores. Database name length must be less than 64 characters.")