You can try ... regular expression equivalent classes ... for example ...
$regexp('ÀÁÂÃÄÅĀĂĄ','[[=A=]]','A') ==> AAAAAAAAA
$regexp('a, á, à and â','[[=a=]]','a') ==> "a, a, a and a"
$regexp('e, é, è and ê','[[=e=]]','e') ==> "e, e, e and e"
$regexp('i, Í, ì and î','[[=i=]]','i') ==> "i, i, i and i"
$regexp('o, ó, ò and ô','[[=o=]]','o') ==> "o, o, o and o"
$regexp('u, ú, ù and û','[[=u=]]','u') ==> "u, u, u and u"
Equivalence classes
An expression of the form [[=col=]], matches any character or collating element whose primary sort key is the same as that for collating element col, as with collating elements the name col may be a symbolic name. A primary sort key is one that ignores case, accentation, or locale-specific tailorings; so for example [[=a=]] matches any of the characters: a, À, Á, Â, Ã, Ä, Å, A, à, á, â, ã, ä and å. Unfortunately implementation of this is reliant on the platform's collation and localisation support; this feature can not be relied upon to work portably across all platforms, or even all locales on one platform.
http://www.boost.org/doc/libs/1_44_0/libs/...erl_syntax.html
You can try ... Mp3tag action groups for "Unicode to ASCII" ...
/t/7279/1
DD.20140914.1030.CEST