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<?php $strings = ["category_4", "office_362", "core_market_56"]; foreach($strings as $string) { var_export(preg_split('/.*\K_/', $string)); }
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.14
array ( 0 => 'category', 1 => '4', )array ( 0 => 'office', 1 => '362', )array ( 0 => 'core_market', 1 => '56', )

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133.76 ms | 407 KiB | 5 Q