<?php $regex = '(^([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*|\0\\\\\0)$)'; $classes = [ 'foo', 'foo\\bar', 'foo\\bar\\baz', ]; foreach ($classes as $class) { var_dump(preg_match($regex, $class)); }
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