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<?php $string = "Porcupines\nare\n\n\n\nporcupiney."; echo preg_replace('/(?:(?:\r\n|\r|\n)\s*){2}/s', "<br /><br />", $string);
Output for git.master, git.master_jit, rfc.property-hooks
Porcupines are<br /><br />porcupiney.

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