DL1231 commented on code in PR #20865:
URL: https://github.com/apache/kafka/pull/20865#discussion_r2520505690
##########
tools/src/main/java/org/apache/kafka/tools/TopicCommand.java:
##########
@@ -751,8 +751,7 @@ public TopicCommandOptions(String[] args) {
KAFKA_CONFIGS_CLI_SUPPORTS_ALTERING_TOPIC_CONFIGS);
describeOpt = parser.accepts("describe", "List details for the
given topics.");
topicOpt = parser.accepts("topic", "The topic to create, alter,
describe or delete. It also accepts a regular " +
- "expression, except for --create option. Put topic
name in double quotes and use the '\\' prefix " +
- "to escape regular expression symbols; e.g.
\"test\\.topic\".")
+ "expression, except for --create option. Put topic
name in double quotes; e.g. \"test.*\".")
Review Comment:
When there is no backslash, double quotes are required, see following
example:
```
[root@test bin]# sh kafka-topics.sh --bootstrap-server 192.168.111.50:9092
--describe --topic "^topic-\d+$"
Topic: topic-11 TopicId: DQJaLhH2Sn-RONhUVtio7Q PartitionCount: 3
ReplicationFactor: 3
Topic: topic-11 Partition: 0 Leader: 0 Replicas: 0,1,2 Isr:
0,1,2
Topic: topic-11 Partition: 1 Leader: 1 Replicas: 1,2,0 Isr:
1,2,0
Topic: topic-11 Partition: 2 Leader: 2 Replicas: 2,0,1 Isr:
2,0,1
Topic: topic-187863026 TopicId: mTgY2xuRQ5qXmLam67aZnA PartitionCount:
3 ReplicationFactor: 3
Topic: topic-187863026 Partition: 0 Leader: 1 Replicas: 1,2,0
Isr: 1,2,0
Topic: topic-187863026 Partition: 1 Leader: 2 Replicas: 2,0,1
Isr: 2,0,1
Topic: topic-187863026 Partition: 2 Leader: 0 Replicas: 0,1,2
Isr: 0,1,2
[root@test bin]# sh kafka-topics.sh --bootstrap-server 192.168.111.50:9092
--describe --topic "^topic-\\d+$"
Topic: topic-11 TopicId: DQJaLhH2Sn-RONhUVtio7Q PartitionCount: 3
ReplicationFactor: 3
Topic: topic-11 Partition: 0 Leader: 0 Replicas: 0,1,2 Isr:
0,1,2
Topic: topic-11 Partition: 1 Leader: 1 Replicas: 1,2,0 Isr:
1,2,0
Topic: topic-11 Partition: 2 Leader: 2 Replicas: 2,0,1 Isr:
2,0,1
Topic: topic-187863026 TopicId: mTgY2xuRQ5qXmLam67aZnA PartitionCount:
3 ReplicationFactor: 3
Topic: topic-187863026 Partition: 0 Leader: 1 Replicas: 1,2,0
Isr: 1,2,0
Topic: topic-187863026 Partition: 1 Leader: 2 Replicas: 2,0,1
Isr: 2,0,1
Topic: topic-187863026 Partition: 2 Leader: 0 Replicas: 0,1,2
Isr: 0,1,2
[root@test bin]# sh kafka-topics.sh --bootstrap-server 192.168.111.50:9092
--describe --topic ^topic-\d+$
Error while executing topic command : Topic '^topic-d+$' does not exist as
expected
[2025-11-13 08:34:18,254] ERROR java.lang.IllegalArgumentException: Topic
'^topic-d+$' does not exist as expected
at
kafka.admin.TopicCommand$.kafka$admin$TopicCommand$$ensureTopicExists(TopicCommand.scala:402)
at
kafka.admin.TopicCommand$TopicService.describeTopic(TopicCommand.scala:314)
at kafka.admin.TopicCommand$.main(TopicCommand.scala:62)
at kafka.admin.TopicCommand.main(TopicCommand.scala)
(kafka.admin.TopicCommand$)
[root@test bin]# sh kafka-topics.sh --bootstrap-server 192.168.111.50:9092
--describe --topic ^topic-\\d+$
Topic: topic-11 TopicId: DQJaLhH2Sn-RONhUVtio7Q PartitionCount: 3
ReplicationFactor: 3
Topic: topic-11 Partition: 0 Leader: 0 Replicas: 0,1,2 Isr:
0,1,2
Topic: topic-11 Partition: 1 Leader: 1 Replicas: 1,2,0 Isr:
1,2,0
Topic: topic-11 Partition: 2 Leader: 2 Replicas: 2,0,1 Isr:
2,0,1
Topic: topic-187863026 TopicId: mTgY2xuRQ5qXmLam67aZnA PartitionCount:
3 ReplicationFactor: 3
Topic: topic-187863026 Partition: 0 Leader: 1 Replicas: 1,2,0
Isr: 1,2,0
Topic: topic-187863026 Partition: 1 Leader: 2 Replicas: 2,0,1
Isr: 2,0,1
Topic: topic-187863026 Partition: 2 Leader: 0 Replicas: 0,1,2
Isr: 0,1,2
```
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