Regex matching seems ignore the `:` ?

[greenl]

Here is my mongodb shell session

> db.foo.save({path: 'a:b'})

WriteResult({ "nInserted" : 1 })

> db.foo.findOne()

{ "_id" : ObjectId("58fedc47622e89329d123ee8"), "path" : "a:b" }

> db.foo.save({path: 'a:b:c'})

WriteResult({ "nInserted" : 1 })

> db.foo.find({path: /a:[^:]+/})

{ "_id" : ObjectId("58fedc47622e89329d123ee8"), "path" : "a:b" }

{ "_id" : ObjectId("58fedc57622e89329d123ee9"), "path" : "a:b:c" }

> db.foo.find({path: /a:[a-z]+/})

{ "_id" : ObjectId("58fedc47622e89329d123ee8"), "path" : "a:b" }

{ "_id" : ObjectId("58fedc57622e89329d123ee9"), "path" : "a:b:c" }

Clearly the regex /a:[^:]+/ and /a:[a-z]+/ shall not match 'a:b:c', but looks like mongo failed on this regex, does anyone know what happened here?

[greenl]

Sorry please ignore the this thread. Just realized it is not a morphia issue.