java去掉html标签 必须首先去掉双引号的正则

public static string htmltostr(string htmlstr){
string result = "";
boolean flag = true;
if(htmlstr==null){
return null;
}

htmlstr = htmlstr.replace(""", ""); //去掉引号

char[] a = htmlstr.tochararray();
int length=a.length;
for(int i=0;i<length;i++){
if(a[i]=='<'){
flag=false;
continue;
}
if(a[i]=='>'){
flag=true;
continue;
}
if(flag==true){
result+=a[i];
}
}
return result.tostring();
}