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Steps To Reproduce:
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Create a collection named "a" with the following one single document:

{ "_id" : ObjectId("5de69716abd1d74e8cb2a026"), // no matter "fld" : "c!" }

2. Run the following aggregation query:

db.getCollection("a").aggregate( [ { "$match" : { "$expr" : { "$regexMatch" : { "input" : "$fld", "regex" : "^c(a|b)?!$" } } } } ] );

Expected result: one document found

Actual result: error

{ "ok" : 0.0, "errmsg" : "Error occurred while executing the regular expression in $regexMatch. Result code: 1", "code" : NumberInt(51156), "codeName" : "Location51156" }
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Create a collection named "a" with the following one single document: { "_id" : ObjectId("5de69716abd1d74e8cb2a026"), // no matter "fld" : "c!" } 2. Run the following aggregation query: db.getCollection("a").aggregate( [ { "$match" : { "$expr" : { "$regexMatch" : { "input" : "$fld", "regex" : "^c(a|b)?!$" } } } } ] ); Expected result: one document found Actual result: error { "ok" : 0.0, "errmsg" : "Error occurred while executing the regular expression in $regexMatch. Result code: 1", "code" : NumberInt(51156), "codeName" : "Location51156" }

The comment to the code mentions "The latter scenario should never occur" but it does

duplicates

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