var replaceString = function(str, data, replaceWith,type) {

      var boundary = "",space ="";
      if(type === 'hashtag') {
          boundary = "#"
      } else if(type === "mentions") {
          space = " ";
      }
      data = data.replace(/([.?*+^$[]\(){}|-])/g, "\$&");
      //return str.replace(new RegExp("(?:^|\s)("+data+")(?!\s)", 'g')," "+replaceWith);
      return str.replace(new RegExp("(?:^|\b|\s)(" +  data + ")(?!$\b\s"+boundary+")","g")," "+replaceWith+space);
  };