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<?php $string = " text1 .id.123 .id.4576 text4 .id.56778 text 5 .id.76728"; preg_match_all('~\.id\.\K\d+~', $string, $m); echo implode(',', $m[0]);
Output for git.master, git.master_jit, rfc.property-hooks
123,4576,56778,76728

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