<?php preg_match_all('~[\\\\a-z0-9_]~', 'a\\\\b', $matches); print_r($matches); preg_match_all('~[a-z0-9_\\\\]~', 'a\\\\b', $matches); print_r($matches); preg_match_all('~[\\d-z]~', 'a\\\\b', $matches); print_r($matches); preg_match_all('~[\\\\d-z]~', 'a\\\\b', $matches); print_r($matches);
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