There are are some links regarding regular expressions ...
Einstieg in die Welt der Regulären Ausdrücke siehe dort ...
http://zmievski.org/c/dl.php?file=talks/co...egex-clinic.pdf
Wikipedia ...
http://de.wikipedia.org/wiki/Regul%C3%A4rer_Ausdruck
Regular Expression Basic Syntax Reference ...
http://www.regular-expressions.info/reference.html
Regular Expression Tutorial ...
http://www.regular-expressions.info/tutorial.html
Mp3tag Manual ...
https://docs.mp3tag.de/actions/replace-regexp
Mp3tag Examples ...
/t/521/1
DD.20121111.2125.CET