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<?php $strs = ['2 + 2', 'f( " ")', 'f("Test \\"mystring\\" .")', 'f("\' ", " ")']; $rx = '~(?<!\\\\)(?:\\\\{2})*(?:"[^\\\\"]*(?:\\\\.[^"\\\\]*)*"|\'[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*\')(*SKIP)(*F)|\h+~s'; print_r( preg_replace($rx, '', $strs) );
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 2+2 [1] => f(" ") [2] => f("Test \"mystring\" .") [3] => f("' "," ") )

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