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```
  (?<!\\)
  ((?:\\{2})*)
```

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for ($string) {
    $result .= $1 if /\G ([^\\*?]+) /xgcs;
...
    /\G \*    /xgcs && do { $result .= '?';  redo; };
    /\G \?    /xgcs && do { $result .= '#';  redo; };
}