小弟对正则一窍不通,所以请哪位大侠帮个忙,把下面这个javascript的函数翻译成C#的函数
function html_trans(str) {
str = str.replace(/\r/g,"");
str = str.replace(/on(load|click|dbclick|mouseover|mousedown|mouseup)="[^"]+"/ig,"");
str = str.replace(/<script[^>]*?>([\w\W]*?)<\/script>/ig,"");
str = str.replace(/<a[^>]+href="([^"]+)"[^>]*>(.*?)<\/a>/ig,"\n
$2\n");
str = str.replace(/<font[^>]+color=([^ >]+)[^>]*>(.*?)<\/font>/ig,"\n[color=$1]$2[/color]\n");
str = str.replace(/<img[^>]+src="([^"]+)"[^>]*>/ig,"\n[img]$1[/img]\n");
str = str.replace(/<([\/]?)b>/ig,"[$1b]");
str = str.replace(/<([\/]?)strong>/ig,"[$1b]");
str = str.replace(/<([\/]?)u>/ig,"[$1u]");
str = str.replace(/<([\/]?)i>/ig,"[$1i]");
str = str.replace(/ /g," ");
str = str.replace(/&/g,"&");
str = str.replace(/"/g,"\"");
str = str.replace(/</g,"<");
str = str.replace(/>/g,">");
str = str.replace(/<br>/ig,"\n");
str = str.replace(/<[^>]*?>/g,"");
str = str.replace(/\[url=([^\]]+)\]\n(\[img\]\1\[\/img\])\n\[\/url\]/g,"$2");
str = str.replace(/\n+/g,"\n");
return str;
}