TL;DR
Use (.*?) to match anything in the given context.
Use \1 to replace with the matched value.
e.g.
Find: <use xlink:href="(.*?)”>
Repl...
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This info helped me in that I learned of
(.*?)which I didn't know about before.I was able to do this as a result and it saved the day.
<input value="(.*?)”><input value="CONSISTENT_VALUE_NOW”>