Incorrect regex for compound keys

[men232]

Hey, have a issues with this error message parsing E11000 duplicate key error index: heroku_4k0w7dhh.users.$email_1 dup key:.

Current regex parse this as: heroku_4k0w7dhh.users.$email_1.
Actually these are my collection indexes:

{ name_1: [ [ 'name', 1 ] ],
  email_1: [ [ 'email', 1 ] ],
  _id_: [ [ '_id', 1 ] ],
  phone_1: [ [ 'phone', 1 ] ] } 

As a result, I do not get a beautiful error.

[sato-sh]

I too am experiencing this same issue and the PR seems to fix this