regex in javascript

regex.js

var re = new RegExp("\\{\\{if " + "hoge" + "\\}\\}(.*)\\{\\{\\/if\\}\\}", "g");
var str = "前 {{if hoge}}ここはifの中{{/if}}あと";
console.log(re.exec(str));
/*
[ '{{if hoge}}ここはifの中{{/if}}',
  'ここはifの中',
  index: 2,
  input: '前 {{if hoge}}ここはifの中{{/if}}あと' ]
*/