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<?php $pattern = "/^([A-Z\d]+)\[(?|(\d+)-(\d+)|([A-Z])-([A-Z]))]|([A-Z\d]+)$/"; $strings = [ "SW[1-3]", "LD1[A-D]", "LD1" ]; foreach ($strings as $s) { if (preg_match($pattern, $s, $match)) { if (array_key_exists(4, $match)) { echo $match[4] . PHP_EOL; continue; } foreach (range($match[2], $match[3]) as $m) { echo $match[1] . $m . PHP_EOL; } } }
Output for git.master, git.master_jit, rfc.property-hooks
SW1 SW2 SW3 LD1A LD1B LD1C LD1D LD1

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