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string := Y#$*&a#^&@y*1
Do something
MsgBox %stringfiltered%

And it shows Yay1

;----------  remove special characters from string ----------------------
autotrim,off
AAA = Y#$* &a#-^&@y_*1

new2=
Loop,Parse,AAA
         {
         A:=(Asc(A_LoopField))
         B:=chr(a)
         if (B="_" OR B=" " OR B="-")     ;allow some characters like _- and space when autotrim is off
         Goto,SKIP8
         if ((a<48 or a>57) AND A<65 OR A>90 AND A<97 OR A>122)
         continue
         SKIP8:
         new2=%new2%%b%
         }

msgbox,%new2%
return

MsgBox, % alnum( "Y#$*&a#^&@y*1" )

alnum( str ) {
 loop, parse, str
  If a_loopField is alnum
    rstr .= a_loopfield
return rstr     
}

InputBox, iString, String Check, Type in a string to be filtered.
FilterList := "@#$%^&*()"
fLen := StrLen(FilterList)
loop
{
StringMid, StopThis, FilterList, %A_Index%, 1
StringReplace, iString, iString, %StopThis% ,,All
if A_Index >= %fLen%
   break
}
Msgbox %iString%

stringfiltered := RegExReplace(string, "\W")