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<?php $test=array("abcd/abcd_.mp3", "abcd", "asdasd/abcd.mp3", "abcd.", "blahahbasdabcd"); $searchTerm = "abcd"; $replaceTerm = "XXXX"; foreach ($test as $t) echo "$t => " . preg_replace("/(". preg_quote($searchTerm) . "([^_.])|". preg_quote($searchTerm) . "$)/x", preg_quote($replaceTerm) . "\${2}", $t) . "\n";
Output for git.master, git.master_jit, rfc.property-hooks
abcd/abcd_.mp3 => XXXX/abcd_.mp3 abcd => XXXX asdasd/abcd.mp3 => asdasd/abcd.mp3 abcd. => abcd. blahahbasdabcd => blahahbasdXXXX

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