- [√] I have searched the [issues](https://github.com/apache/dubbo/issues) of
this repository and believe that this is not a duplicate.
- [√] I have checked the
[FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository
and believe that this is not a duplicate.
### Environment
* Dubbo version: 2.7.3
* Operating System version: MacOS 10
* Java version: Oracle JDK 1.8
### Steps to reproduce this issue
1. xxx
2. xxx
3. xxx
Pls. provide [GitHub address] to reproduce this issue.
### Expected Result
What do you expected from the above steps？
### Actual Result
Cannot configure zookeeper cluster address after using multiple registry
Only one address can be configured when using multiple:
```
<dubbo:registry address="
multiple://127.0.0.1?
reference-registry=zookeeper://127.0.0.1:2182,sofa://127.0.0.1:9603&
service-registry=zookeeper://127.0.0.1:2182,sofa://127.0.0.1:9603"/>
```
If you use the backup field, could only add one more address:
```
<dubbo:registry address="
multiple://127.0.0.1?
reference-registry=zookeeper://127.0.0.1:2182?backup=127.0.0.1:2181,sofa://127.0.0.1:9603&
service-registry=zookeeper://127.0.0.1:2182?backup=127.0.0.1:2181,sofa://127.0.0.1:9603"/>
```
The previous configuration is like this:
```
<dubbo:registry protocol="zookeeper"
address="10.20.153.10:2181,10.20.153.11:2181,10.20.153.12:2181" />
```
Only configuring two addresses does not meet the demand.
[ Full content available at: https://github.com/apache/dubbo/issues/5121 ]
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