How do I add index tags to text already set with a character style? I think I can use GREP search and replace for this, but can't figure out the GREP string that will add the tags. The replace string I keep trying to find is "$0 \~I" and variations on that theme, but I'm clearly not escaping the inserted tag properly, so it's literally inserting the "~I".
FOLLOW-ON! The solution is suitably LOW TECH! Select an existing index tag. Copy it. In the GREP replace, choose Special Characters, Other, Clipboard contents in front of the $0 for the search string. Done. Hours and hours of repetitive keying done in half an hour.