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void Main()
{
string html=@"#nav_menu {background-repeat:no-repeat;color:#000000;float:left;height:30px;left:237px;position:absolute;text-align:center;top:32px;}";
html= Regex.Replace(html,@"left:\d+px;|top:\d+px;","");
Console.Write(html);
}
/*
结果:
#nav_menu {background-repeat:no-repeat;color:#000000;float:left;height:30px;position:absolute;text-align:center;}
*/