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<?php $string = 'Hello "world". [start]this is a "mark"[end]. It should work with [start]"several" "marks"[end]'; $regex = '/(?s)"(?=((?!\[start\]).)*\[end\])/'; $replace = '&quot;'; echo preg_replace($regex, $replace, $string);
Output for git.master, git.master_jit, rfc.property-hooks
Hello "world". [start]this is a &quot;mark&quot;[end]. It should work with [start]&quot;several&quot; &quot;marks&quot;[end]

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