Rusty Wright wrote: [...]
The \( \) is the grouping thing where what matches in it is then substituted for as the \1 on the right hand side.
Yes, but if you escape them with \ , do they still get seen as (meta) grouping indicators, or as plain "(" and ")" ? (I don't remember what sed wants precisely, but in a perl regex, escaping the () would not work as you intend; it would look for real (), and not group.
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