s3tables: Separate table name pattern constant for clarity

Define a separate tableNamePatternStr constant for the table name component in
the ARN regex, even though it currently has the same value as
tableNamespacePatternStr. This improves code clarity and maintainability, making
it easier to modify if the naming rules for tables and namespaces diverge in the
future.

weed/s3api/s3tables/utils.go

@@ -14,11 +14,12 @@ import (
 const (
 	bucketNamePatternStr     = `[a-z0-9-]+`
 	tableNamespacePatternStr = `[a-z0-9_]+`
+	tableNamePatternStr      = `[a-z0-9_]+`
 )
 
 var (
 	bucketARNPattern = regexp.MustCompile(`^arn:aws:s3tables:[^:]*:[^:]*:bucket/(` + bucketNamePatternStr + `)$`)
-	tableARNPattern  = regexp.MustCompile(`^arn:aws:s3tables:[^:]*:[^:]*:bucket/(` + bucketNamePatternStr + `)/table/(` + tableNamespacePatternStr + `)/(` + tableNamespacePatternStr + `)$`)
+	tableARNPattern  = regexp.MustCompile(`^arn:aws:s3tables:[^:]*:[^:]*:bucket/(` + bucketNamePatternStr + `)/table/(` + tableNamespacePatternStr + `)/(` + tableNamePatternStr + `)$`)
 )
 
 // ARN parsing functions