[color="#00ff00"]colored text[/color]

[color="#00ffsdafasdfasdf00"]colored text[/color]
[color="#00ff00"]colored text[/cafdsafafaolor]
[coadfafaslor="#00ff00"]colored text[/color]

function ReplaceFontColor(fString)
Set regEx = New RegExp
regEx.Pattern =  "\[color=("")(\#)([a-fA-F0-9]{6})("")\](.*?)\[/color\]"
regEx.Global = True
Set Matches = regEx.Execute(fString)

if matches.count <> 0 then
	for each match in matches
	changecolor = Replace(Replace(Replace(match.value,"[color=""","<font color="""),"""]",""">"),"[/color]","</font>")
	fstring = Replace(fstring, match.value, changecolor)
	next
end if

ReplaceFontColor = fstring
Set regEx = Nothing
end function

            Regex colourregex = new Regex(@"\[(#[a-fA-F0-9]{2,6})\]");
            MatchCollection MatchList = colourregex.Matches(fString);

            string thismatch;
            foreach (Match m in MatchList)
            {
                thismatch = m.Groups[1].Value;
                fString = Regex.Replace(fString, @"\[(" + thismatch + @")\](.*?)\[\/" + thismatch + @"\]", "<span style='color:$1'>$2</span>", matchOptions);
            }