3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $c = json_encode(["foo"=>["password"=>"foo\\\"bar"]]); echo $c; echo preg_replace('{("password"\s*:\s*)"(?:\\\\\\\\)*"}', '$1"****"', $c);
based on EGQCq
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.0
{"foo":{"password":"foo\\\"bar"}}{"foo":{"password":"foo\\\"bar"}}