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  1. Core Server
  2. SERVER-22939

A regular expression with an escaped pipe '|' character is treated as non-simple

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Details

    • Bug
    • Status: Closed
    • Critical - P2
    • Resolution: Duplicate
    • 3.2.3
    • None
    • Querying
    • None
    • ALL
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      See the referenced issues. Note that I see this as critical because this breaks functionality that has worked for years. We depend on this functionality.

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      See the referenced issues. Note that I see this as critical because this breaks functionality that has worked for years. We depend on this functionality.

    Description

      This seems to be a regression from the fix of SERVER-15235.

      The problem with this fix is that, even when I have a regular expression that has a left-anchor and an escaped '|' character, that query is recognized as being "non-simple".

      This is wrong, and it causes unnecessarily that backwards compatibility is broken and performance is significantly degraded. See SERVER-22872 and SERVER-22890.

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        Issue Links

          duplicates

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-16622 RegEx query predicates using the | (vertical bar) character cannot use tight index bounds

          • Major - P3 - Major loss of function.
          • Backlog

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            People

              ramon.fernandez@mongodb.com Ramon Fernandez Marina
              itwebtf@saxobank.com ITWEBTF SAXOBANK
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                Created:
                Updated:
                Resolved: