regex - How to split string in MongoDB? -


the example data following: 

{"brandid":"a","method":"put","url":"/random/widgets/random/state"} {"brandid":"a","method":"post","url":"/random/collection/random/state"} {"brandid":"b","method":"put","url":"/random/widgets/random/state"} {"brandid":"b","method":"put","url":"/random/widgets/random/state"}

i need find rows method=put , url in pattern /random/widgets/random/state. "random" random string fixed length. expected result :

{"brandid":"a","total":1} {"brandid":"b","total":2}

i tried write code :

db.accesslog.aggregate([     {$group: {         _id: '$brandid',         total: {                 $sum:{                   $cond:[{$and: [ {$eq: ['$method', 'post']},                         {url:{$regex: /.*\/widgets.*\/state$/}} ]}, 1, 0]                 }             },     {$group: {         _id: '$_id',        total:{$sum:'$total'}     } ])

but regular expression not work, suppose need try other way it, perhaps split string. , need use $cond. please keep it. thanks!

greedy matching problem.

assuming non-zero number of 'random' characters (sounds sensible), try regex of:

/[^\/]+\/widgets\/[^\/]+\/state$/

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