mattisonchao commented on issue #19770:
URL: https://github.com/apache/pulsar/issues/19770#issuecomment-1485214785
Yes, the topic name should follow the rule as follow:
```java
// allowed characters for property, namespace, cluster and topic names
are
// alphanumeric (a-zA-Z_0-9) and these special chars -=:.
// % is allowed as part of valid URL encoding
public static final Pattern NAMED_ENTITY_PATTERN =
Pattern.compile("^[-=:.\\w]*$");
```
Pulsar hasn't a good topic name limit yet, but it is being added.
/cc @tisonkun @KamenRiderKuuga
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