Template syntax in javascript

template.js

var template = "<div><h1>{{title}}</h1></div> <div><h1>{{name}}</h1></div>"
var content = {
  "title": 'Hello world'
  "name": 'Jack'
}

function replacer(match, p1, offset, string) {
  for (var key in content) {
    if (p1.indexOf(key) != '-1') {
      p1 = content[key]
    };
  };
  // p1 is nondigits, p2 = digits, p3 = non-alphanumerics
  return p1;
};

replaced = template.replace(/(\{\{[\S]*\}\})/g, replacer);