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<?php $str = 'abc | xx ?? "1 x \' 3" d e f \' y " 5 \' x yz'; echo preg_replace('~(?<!\\\\)(?:\\\\{2})*(?:"[^"\\\\]*(?:\\\\.[^"\\\\]*)*"|\'[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*\')(*SKIP)(?!)|\s+~s', '', $str);
Output for git.master, git.master_jit, rfc.property-hooks
abc|xx??"1 x ' 3"def' y " 5 'xyz

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