Use a function for the second argument for .replace()
that returns the actual matched string with the concatenated tags.
Try it out: http://jsfiddle.net/4sGLL/
reg = new RegExp(querystr, 'gi');
// The str parameter references the matched string
// --------------------------------------v
final_str = 'foo ' + result.replace(reg, function(str) {return '<b>'+str+'</b>'});
$('#' + id).html(final_str);
…
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