<?php $ps = ["fo\"obar", "foobar\"", "foobar\\\\\"", "foo\\\"\"bar"]; foreach ($ps as $p) { $c = json_encode(["foo"=>["password"=>$p]]); echo preg_replace('{("password"\s*:\s*)"(?:[^"\\\\]|(?:\\\\.))*"}', '$1"****"', $c), "\n"; }
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