<?php $strs = ['2 + 2', 'f( " ")', 'f("Test \\"mystring\\" .")', 'f("\' ", " ")']; $rx = '~(?<!\\\\)(?:\\\\{2})*(?:"[^\\\\"]*(?:\\\\.[^"\\\\]*)*"|\'[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*\')(*SKIP)(*F)|\h+~s'; print_r( preg_replace($rx, '', $strs) );
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Value for `_results` contains invalid data `array`