V2.44 filter accepts regular expressions directly e.g. http://img136.imageshack.us/img136/1724/fi...hvariouskm6.gif . This is broken in V2.45 and later (cases #3,#4 and #5 in that example fail) apparently by removal of this feature, but this removal is missing from the changelog http://www.mp3tag.de/en/changelog.html
Possible workaround for the breakage: prefix the regular expression with "* MATCHES " e.g. "* MATCHES Angelis .*$" . This case works but I have not done wider testing.