/usr/share/php/smarty3/plugins/ is in smarty-validate 3.0.3-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/php/smarty3/plugins/function.validate.php
/usr/share/php/smarty3/plugins/function.validate_init.php
/usr/share/php/smarty3/plugins/validatecriteria.dummyvalid.php
/usr/share/php/smarty3/plugins/validatecriteria.isccexpdate.php
/usr/share/php/smarty3/plugins/validatecriteria.isccnum.php
/usr/share/php/smarty3/plugins/validatecriteria.isdate.php
/usr/share/php/smarty3/plugins/validatecriteria.isdateafter.php
/usr/share/php/smarty3/plugins/validatecriteria.isdatebefore.php
/usr/share/php/smarty3/plugins/validatecriteria.isdateequal.php
/usr/share/php/smarty3/plugins/validatecriteria.isdateonorafter.php
/usr/share/php/smarty3/plugins/validatecriteria.isdateonorbefore.php
/usr/share/php/smarty3/plugins/validatecriteria.isemail.php
/usr/share/php/smarty3/plugins/validatecriteria.isequal.php
/usr/share/php/smarty3/plugins/validatecriteria.isfilesize.php
/usr/share/php/smarty3/plugins/validatecriteria.isfiletype.php
/usr/share/php/smarty3/plugins/validatecriteria.isfloat.php
/usr/share/php/smarty3/plugins/validatecriteria.isint.php
/usr/share/php/smarty3/plugins/validatecriteria.islength.php
/usr/share/php/smarty3/plugins/validatecriteria.isnumber.php
/usr/share/php/smarty3/plugins/validatecriteria.isprice.php
/usr/share/php/smarty3/plugins/validatecriteria.isrange.php
/usr/share/php/smarty3/plugins/validatecriteria.isregexp.php
/usr/share/php/smarty3/plugins/validatecriteria.isurl.php
/usr/share/php/smarty3/plugins/validatecriteria.notempty.php
/usr/share/php/smarty3/plugins/validatetransform.default.php
/usr/share/php/smarty3/plugins/validatetransform.makedate.php
/usr/share/php/smarty3/plugins/validatetransform.trim.php