[FLINK-20026][Connector][Jdbc] Jdbc connector support regular expression

[xiaoHoly]

What is the purpose of the change

Jdbc connector support regular expression

Brief change log

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

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/Mesos, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not documented

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Automated Checks

Last check on commit 14d72b3 (Fri May 28 07:10:34 UTC 2021)

Warnings:

• No documentation files were touched! Remember to keep the Flink docs up to date!
• This pull request references an unassigned Jira ticket. According to the code contribution guide, tickets need to be assigned before starting with the implementation work.

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• ❓ 1. The [description] looks good.
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• ❓ 3. Needs [attention] from.
• ❓ 4. The change fits into the overall [architecture].
• ❓ 5. Overall code [quality] is good.

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CI report:

• 14d72b3 Azure: FAILURE

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[JavaPentesters]

Thanks for your nice work! It's a good idea to add a unit test! Please Refer to the existing unit tests class:org.apache.flink.connector.jdbc.table.JdbcDynamicTableFactoryTest

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[MartijnVisser]

@xiaoHoly We've now moved the code from the JDBC connector to its own dedicated repository; please re-route this PR to https://github.com/apache/flink-connector-jdbc