This script will rename the selected tracks in iTunes with their filenames (minus the extension).
There is no accounting for track numbers that may prefix the filename.
To remove characters from the beginning of tag text try using the script Remove n Characters From Front or Back.
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Perform search-and-replace on text in your choice of tags
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Remove iTunes tracks disassociated from files
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Use tag data to formulate new file name for selected tracks' files
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Append beginning of selected tracks' filenames with Artist name