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<?php function normalise($string) { preg_match('~[a-z0-9]+$~i', $string, $match); if ( ! isset($match[0])) { return false; } return strtoupper($match[0]); } echo normalise('Deu-12345tx'), PHP_EOL;
Output for git.master, git.master_jit, rfc.property-hooks
12345TX

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