Describe the bug
Regex evaluator used is susceptible to exponential backtracking attacks. This can be mitigated by using a non-backtracking evaluator like re2 https://github.com/google/re2j.

To Reproduce
Steps to reproduce the behavior:

• Go to DropEventsProcessorIT
• Create an adversarial case in the test cases
  • Replace the value in my_key to "a".repeat(256*1024) + "b"
  • Change the drop_when condition in drop_when_value_is_empty_string.yaml to /my_key =~ "(a+)+".
• Build the drop_events plugin ./gradlew build -p /path/to/workspace/data-prepper/data-prepper-plugins/drop-events-processor
• The tests never finish running.

Expected behavior
Regex evaluation should complete.

Screenshots
If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• OS: MacOS
• Version [e.g. 22]

Additional context
Some things to consider:

• This is an issue only when a service uses data-prepper as a service-side application and accepts inputs/configurations from potentially untrusworthy sources.
• Re2J has some limitations in features in exchange for the linear time complexity guarantee, biggest one being that backreferencing is not supported.