[cdc] fix special regex characters unescaped in excluded table patterns (#7619)

Author: ziyanTOP

paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/CdcActionCommonUtils.java

@@ -36,6 +36,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
 import static org.apache.paimon.flink.action.MultiTablesSinkMode.COMBINED;
@@ -302,19 +303,19 @@ public static String combinedModeTableList(
         // be excluded by excluding pattern at the same time
         String includingPattern =
                 String.format("(%s)\\.(%s)", databasePattern, includingTablePattern);
-
+        LOG.info("Combined mode including pattern is {}", includingPattern);
         if (excludedTables.isEmpty()) {
             return includingPattern;
         }
 
+        // Use Pattern.quote to escape special regex characters (e.g., '$' in mysql table name)
+        // in database and table names, ensuring exact literal matching in the regex.
         String excludingPattern =
                 excludedTables.stream()
-                        .map(
-                                t ->
-                                        String.format(
-                                                "(^%s$)",
-                                                t.getDatabaseName() + "\\." + t.getObjectName()))
+                        .map(Identifier::getFullName)
+                        .map(n -> String.format("(^%s$)", Pattern.quote(n)))
                         .collect(Collectors.joining("|"));
+        LOG.info("Combined mode excluding pattern is {}", excludingPattern);
         excludingPattern = "?!" + excludingPattern;
         return String.format("(%s)(%s)", excludingPattern, includingPattern);
     }