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    qr"..." delimiters) normalizes the expression -- re-orders the content
+s as in your examples.</p>

<p>And my attempts to requote (using <c>\"
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    |abd| matches |(?^u:a[bc]d)|: yes
|acd| matches |(?^u:a[bc]d)|: yes
|abcd| matches |(?^u:a[bc]d)|: no
|a[bc]d| matches |(?^u:a[bc]d)|: no