UPDATED: Search-Replace Tag Text v3.3
Search-Replace Tag Text v3.3 performs a search-and-replace with the text in your choice of tag (Song Name, Show, Artist, Album Artist, Album, Composer, Comments, Genre, or Grouping) in the selected tracks or all the tracks in the selected Playlist. Features case sensitivity and whole word match options and dry run preview.
The latest version sports conventional search fields and has some minor code tweaks.