The server accepts invalid regular expressions in the match language. It appears that such invalid regular expressions will match nothing:
> db.c.drop(); true > db.c.insert({a: 1, b: "["}); WriteResult({ "nInserted" : 1 }) > db.c.find({a: 1, b: {$regex: "["}}); // Empty result set.
In order to fix this, the MatchExpression library should call pcrecpp::RE::error() and check whether the resulting error string is non-empty:
This bug appears to affect all versions of the server since at least 2.6.
- causes
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SERVER-34933 pcre verb support
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- Closed
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- related to
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- Closed
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SERVER-39697 Regex MatchExpression should error at parse time if the regex is not valid
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- Closed
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