https://bugzilla.wikimedia.org/show_bug.cgi?id=24526

           Summary: Add support of special escapes for matching
                    sub-expressions in 'Replace with' at Search&Replace
                    windows
           Product: MediaWiki extensions
           Version: any
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: UsabilityInitiative
        AssignedTo: tpars...@wikimedia.org
        ReportedBy: wizard...@ya.ru
                CC: roan.katt...@gmail.com, ngau...@wikimedia.org,
                    amil...@wikimedia.org


The RegExp engine of JavaScript supports substitution of matching
sub-expressions given in parentheses. And Search&Replace interface supports
sub-expressions in 'Search for' field as well. But the 'Replace with' field
doesn't support any escape sequences to substitute matching sub-expressions
back to the resulting output. Those are %1,%2 (like in JS), \1,\2 (like in
sed), etc.

Implementing escape sequences for this stuff would be great.

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