dylanhz opened a new pull request, #25137:
URL: https://github.com/apache/flink/pull/25137
## What is the purpose of the change
Add REGEXP_EXTRACT_ALL function.
Examples:
```SQL
> SELECT REGEXP_EXTRACT_ALL('100-200, 300-400', '(\\d+)-(\\d+)', 1);
[100, 300]
```
## Brief change log
[FLINK-35931](https://issues.apache.org/jira/browse/FLINK-35931)
## Verifying this change
`RegexpFunctionsITCase#regexpExtractAllTestCases`
`RegexpFunctionsITCase` is a new test class for regex functions, which was
created to keep `StringFunctionsITCase` clean. Tests of regex functions in the
future (regexp_count, regexp_sbstr...) should be added in this class rather
than the string one, and existing test of REGEXP_EXTRACT currently in string
class should be migrated here as well.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (yes)
- If yes, how is the feature documented? (docs)
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