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<?php $str = '(a,b),a,b,c,(a,f)'; $str = preg_replace_callback('`("|\').*?\1`', function ($matches) { return preg_replace('`(?<!\\\)[()]`', '\\\;', $matches[0]); }, $str); echo $str;
Output for git.master, git.master_jit, rfc.property-hooks
(a,b),a,b,c,(a,f)

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