Regex diacritics: how to replace accented characters by their non-accentedcounterparts? ASCII codes

[me_suzy]

hello. How can I convert with regex all those ASCII codes:

ă with ă or with a
&#355; with ţ or with t
î with î or with i
etc…

here you have the whole list http://www.starr.net/is/type/htmlcodes.html