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<?php $a = ['adsd.pdf', 'adsd_1.pdf', 'asdasd.docx']; $b = 'adsd'; for($i = 0; $i < count($a); $i++) { print_r(preg_match('/\$' . $b . '_' . '/', $a[$i])); }

preferences:
68.07 ms | 402 KiB | 5 Q