How to use regex in addFields aggregate with mongodb

Ask Time：2019-09-20T18:27:44 Author：Rakesh

I want to use regex in addFiels in aggregate with mongodb, but I am not able to do that below is my code which I have tried

$addFields: {slug: {$title: {$regex: '/^[^_s]*$/'}}}

but this is giving mongo error. Please find me solution. My expected output should be slug: "This-is-my-1st-adventure". In my db title: "This is my 1st adventure"

Author:Rakesh，eproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/58026569/how-to-use-regex-in-addfields-aggregate-with-mongodb

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