I have a string where there may be special characters, which I have to replace with hyphen

var str=123.This is,, :ravi

The above string should be converted like this

var newstr=123-This-is-ravi;

I have been trying this

function remove(str){ str.replace(/./g, -); }  //replaces only dots

function remove(str){ str.replace(/ /g, -); }   //replaces only spaces

Can any one help me doing this? I need to replace special chars with hyphen.