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<?php $c = json_encode(["foo"=>["password"=>"foo\\\"bar"]]); echo preg_replace('{("password"\s*:\s*)"([^"\\\\]|(\\"))*"}', '$1"****"', $c);
based on MrmA3
Output for 5.6.0 - 5.6.38, hhvm-3.18.4 - 3.22.0, 7.0.0 - 7.2.11
{"foo":{"password":"foo\\\"bar"}}
Output for hhvm-3.15.4
{"foo":{"password":"foo\\\"bar"}}
Process exited with code 137.