如果子串的一部分为真，则regex as3然后用运行的var替换部分子串

< fontFamily=Verdana encoding=unicode fontWeight="bold"> some text < fontFamily=Verdana encoding=unicode > some text < fontFamily=Arial encoding=unicode fontStyle="italic"> some text < fontFamily=Arial encoding=unicode fontWeight="bold" fontStyle="italic"> some text 

< fontname=Verdanabold encoding=unicode> some text < fontname=Verdana encoding=unicode > some text < fontname=Arialitalic encoding=unicode > some text < fontname=Arialbolditalic encoding=unicode > some text

pattern =   /<(.*?)>/gixsm;
var matches:Object = pattern.exec(str);
var finalstring:String = "";
for each ( var i:String in matches ) {

    if(i!='0'){
        Alert.show(i);
    pattern = /fontFamily="([^"]*)"/i;
    if(pattern.test(i)==true){
        pattern = /fontFamily="([^"]*)" /i;
        var resultfontFamily:Object = pattern.exec(i);
        var fontFamily:String = resultfontFamily[1].toString();



        /*pattern = /fontWeight=".*?" /i;
        if(pattern.test(i)==true){

            pattern = /fontWeight="([^"]*)" /i;
            var resultfontWeight:Object = pattern.exec(i);
            var fontWeight:String  = resultfontWeight[1].toString();
            fontFamily = fontFamily+fontWeight;

        }
        pattern = /fontStyle="([^"]*)" /i;
        if(pattern.test(i)==true){

            pattern = /fontStyle="([^"]*)" /i;
            var resultfontStyle:Object = pattern.exec(i);
            var fontStyle:String  = resultfontStyle[1].toString();
            fontFamily = fontFamily+fontStyle;

        }*/
        fontFamily = "fontname="+fontFamily+" encoding=unicode";
        pattern = /fontFamily=".*?"/i;
        finalstring += i.replace(pattern, fontFamily);

    }
    }

}
str = finalstring;