Remove special characters" but leave all letters (multi-language)

Hello,

I would like to remove all "special characters" but leave all letters.

The problem is that I need to support European languages, many which use letters beyond the 26 that English uses.



These should be REMOVED

< > ( ) ! # $ % ^ & = + ~ ` * " ' ¡ ¤ ¢ £ ¥ ¦ § ¨ © ª «  ¬ ­ ® ™ ¯ ° ± ² ³ ´ µ ¶ · ¸ ¹ º » ¼ ½ ¾ ¿ × ÷

But these should NOT be removed

à á â ã ä å é ê ë ì í î ï ñ ò ó ô õ ö ù ú û ü ý ÿ


There are many more that SHOULD be removed and many more that SHOULD NOT be removed, but the idea is if it can be used any any European language as part of a word I want to keep it.  If not, I want to get rid of it.

Any ideas?

Thanks!