<?php $tests = [ '234534_45_92374', '3433_9458_034857', 'zx_8458_047346daf', ]; foreach ($tests as $test) { preg_match('/_\K\d+/', $test, $match); var_export($match[0]); echo "\t"; sscanf($test, '%*[^_]_%d', $integer); var_export($integer); echo "\n"; }
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