I see you already discovered a solution while I was typing, so I modified it so it will detect and fix Chapter TWENty-oNE as well.
Code:
(Chapter )(\w)(.+?\b)
Replace:
But that won't help when you get as high as "Chapter TWENTY-ONE," soooo.....
Code:
(Chapter )(\w)(.+?\b)((-)(\w)(.+?\b))?
Replace:
Code:
\1\u\2\L\3\E\5\u\6\L\7\E
Should straighten up any capitalization issues of the part that follows "Chapter ", as long as it maintains a standard "word" or "word-word" convention)
"Chapter ONe" will become "Chapter One" and "Chapter THIRTY-two" will become "Chapter Thirty-Two"