How to Remove Currency From The String?

Using Javascipt Regex Remove Currency From String....

function removeCurrency( MyString )
{
var objRegex = /\(/;
var StringMin = '';

if(objRegex.test(MyString))
{
StringMin = '-';
}

objRegex = /\)|\(|[,]/g;
MyString = MyString.replace(objRegex,' ');
if(MyString.indexOf('$') >= 0)
{
MyString = MyString.substring(1, MyString.length);
}
return StringMin + MyString;
}