Thank you both very much; I'm very grateful for your generous expertise.

I have two questions.

1. Will the latest version perform if any of the text is already hyperlinked? I ran Greg's previously-latest version this morning, and found that, where the URL in parentheses was already a hyperlink, the parens were not changed to double brackets.

2. There happened to be in the same article an already-bracketed, but stand-alone comment not related to a url nor followed by one in parentheses. This also got double brackets.

The second issue is certainly minor and not worth bothering with, if it would make the code too fussy (technical term). The first is more the issue, if it is one in the latest version.

Again, my genuine thanks.