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    Type:Improvement 
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    Resolution: Duplicate
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    Priority:Major - P3 
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    Affects Version/s: None
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    Component/s: Aggregation Framework
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        Query 2019-04-08
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This work is separate from the tickets for implementing the new expressions (e.g. SERVER-39695) because it depends on SERVER-39693.
It is also separate from the work to make the existing regex MatchExpression error, since that changes the behavior of a pre-existing feature. This is tracked by SERVER-39697.
- depends on
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                    SERVER-39693 Fix bug in PCRE which reports error for valid regex -         
- Closed
 
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- is duplicated by
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                    SERVER-63654 The $regex operation accepts invalid expressions when used inside an aggregate command -         
- Closed
 
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                    SERVER-39695 Implement $regexFind -         
- Closed
 
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- is related to
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                    SERVER-39697 Regex MatchExpression should error at parse time if the regex is not valid -         
- Closed
 
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