ISSUE-5944: PulsarIO Sink "topics-pattern" regex is not filtering inputs topics correctly

[sijie]

Original Issue: apache#5944

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Describe the bug
PulsarIO Sink "topics-pattern" regex is not working as expected

To Reproduce
We have two topics:

1. ://public/default/topic1
2. ://public/default/topic2

We are using the builtin influxdb connector, so check to have it installed before try to reproduce the behaviour.

Steps to reproduce the behavior:

1. We would like to create a new sink using a regex topic-pattern that has as inputs both topic1 and topic2 and all the topics that start with the character "t" using the pattern "t.*". So, create the Sink using the following command
   pulsar-admin sinks create --tenant public --namespace default --name test-sink --sink-type influxdb --sink-config-file influxdb.yaml --topics-pattern "t.*

This is the influxdb.yaml configuration
configs: influxdbUrl: "http://localhost:8086" database: "test_db" username: "admin" password: "Oncode01" consistencyLevel: "ONE" logLevel: "NONE" retentionPolicy: "autogen" gzipEnable: true batchTimeMs: 1000 batchSize: 200

2. I expcted to have as inputs both topic1 and topic2 but there are no topics as input
3. If I use as topic pattern only ".*" using this command
   pulsar-admin sinks create --tenant public --namespace default --name test-sink --sink-type influxdb --sink-config-file influxdb.yaml --topics-pattern "t.* and the same influxdb.yaml configuration I have correctly topic1 and topic2 as inputs

Expected behavior
The expected behaviour is to have both topic1 and topic2 as the sink inputs.

I suspect this is a bug since I tried with many others regex pattern and no one is working. Only ".*" is working.