sdks/java: support non-ascii BigQuery table name (#33990)

* sdks/java: support Non-ASCI BigQuery table name

* sdks/java: test support Non-ASCI BigQuery tb name

sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BigQueryIO.java

@@ -586,8 +586,22 @@ public class BigQueryIO {
   /** Regular expression that matches Dataset IDs. */
   private static final String DATASET_REGEXP = "[-\\w.]{1,1024}";
 
-  /** Regular expression that matches Table IDs. */
-  private static final String TABLE_REGEXP = "[-\\w$@ ]{1,1024}";
+  /**
+   * Regular expression that matches BigQuery Table IDs.
+   * Supports Unicode characters in categories:
+   * - L (letter)
+   * - M (mark)
+   * - N (number)
+   * As well as:
+   * - Underscore (_)
+   * - Dash (-)
+   * - Dollar sign ($)
+   * - At sign (@)
+   * - Space
+   *
+   * The pattern requires 1-1024 characters matching these categories.
+   */
+  private static final String TABLE_REGEXP = "[-_\\p{L}\\p{N}\\p{M}$@ ]{1,1024}";
 
   /**
    * Matches table specifications in the form {@code "[project_id]:[dataset_id].[table_id]"} or

sdks/java/io/google-cloud-platform/src/test/java/org/apache/beam/sdk/io/gcp/bigquery/BigQueryHelpersTest.java

@@ -87,6 +87,7 @@ public void testTableUrnParsing() {
   @Test
   public void testTableParsing_validPatterns() {
     BigQueryHelpers.parseTableSpec("a123-456:foo_bar.d");
+    BigQueryHelpers.parseTableSpec("a123-456:foo_bar.ग्राहक");
     BigQueryHelpers.parseTableSpec("a12345:b.c");
     BigQueryHelpers.parseTableSpec("a1:b.c");
     BigQueryHelpers.parseTableSpec("b12345.c");