<?php $string = "test #$ test"; $not_acceptable_characters_regex = '#[^-a-zA-Z0-9_ ]#'; $string = preg_replace($not_acceptable_characters_regex, '', $string); echo $string; ?>
<?php $string = "test #$ test"; $not_acceptable_characters_regex = '#[^\w\d_\-]#'; $string = preg_replace($not_acceptable_characters_regex, '', $string); echo $string; ?>
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