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<?php $string = 'start ** not bold ** and **bold** not bold **bold *** still bold** not bold **** not bold ****'; echo preg_replace('/(?<!\*)\*\*(?![\s*])(.*?)(?<![\s*])\*\*(?!\*)/', '<b>$1</b>', $string);
Output for git.master, git.master_jit, rfc.property-hooks
start ** not bold ** and <b>bold</b> not bold <b>bold *** still bold</b> not bold **** not bold ****

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