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<?php $text = "11 a b 13 begin t 899 y 50 f end 91 h"; var_export(preg_match_all('~(?:begin|\G(?!^))(?:(?!end)\D)+\K\d+~s', $text, $out) ? $out[0] : 'no matches');
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array ( 0 => '899', 1 => '50', )
preferences:
97.36 ms | 1930 KiB | 4 Q