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<?php $test=["abcd/abcd_.mp3", "abcd", "asdasd/abcd.mp3", "abcd."]; foreach ($test as $t) echo preg_replace("/abcd([^_.])/", "defg" . "\${1}", $t);
Output for git.master, git.master_jit, rfc.property-hooks
defg/abcd_.mp3abcdasdasd/abcd.mp3abcd.

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