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<?php $string = "1234@#$ABCFG3478&*"; $result = preg_replace("/[^A-Z]+/", "", $string); var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $ABCFG3478 in /in/2trmm on line 3 string(0) ""

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