public function HighLight(S,F)
dim tL,tM,tR,k
tL=""
tM=""
tR=S
k=instr(1,tR,F,1)
do while k>0
tL=tL left(tR,k-1)
tM=mid(tR,k,len(F))
tL=tL "span style='color:red'>" tM "/span>"
tR=right(tR,Len(tR)-len(F)-k+1)
k=instr(1,tR,F,1)
loop
HighLight=tL tR
end function
 tS="abcaBcabCaBCabcaBCa"
tF="bc"
response.Write(tS)
response.Write("br/>")
response.Write(HighLight(tS,tF))

Function HighLight(S,F)
Dim regEx
Set regEx = New RegExp
regEx.IgnoreCase = True
regEx.Global = True
regEx.Pattern = "(" F ")"
HighLight = regEx.Replace(S,"span style='color:red'>$1/span>")
End Function
Response.write HighLight("abcaBcabCaBCabcaBCa","bc")