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  1. Documentation
  2. DOCS-13253

Investigate changes in SERVER-44617: $regexFind crash when one of the capture group doesn't match the input but pattern matches

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      Description

      Downstream Change Summary

      With this change, we will put a 'null' placeholder if there is a non-matching capture group. We should clarify this new semantics using an example in the docs.

      This is also backported to 4.2. We will need to update the docs for 4.2 as well.

      Description of Linked Ticket

      When running a simple regex query against 4.2.1 the mongod will crash with:

      2019-11-14T05:52:41.884-0500 F  -        [conn1] terminate() called. An exception is active; attempting to gather more information
      2019-11-14T05:52:41.982-0500 F  -        [conn1] std::exception::what(): out of range
      

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      Resources (Scope or Design Docs, Invision, etc.)

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            jeffrey.allen@mongodb.com Jeffrey Allen
            backlog-server-pm Backlog - Core Eng Program Management Team
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              Created:
              Updated:
              Resolved:
              4 years, 1 day ago