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<?php $strings = [ 'F7998FM3213/02F', 'J442554NM/05', 'K439459845/34D', 'FOO007/1A2B3CD45EFG6', ]; var_export( preg_replace( '#(?:[^/]*/|\G(?!^))\d*\K\D+#', '', $strings ) );
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 0 => 'F7998FM3213/02', 1 => 'J442554NM/05', 2 => 'K439459845/34', 3 => 'FOO007/123456', )

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