Using html-minifier customAttrSurround for allowing swig template

Gruntfile.js

/**
 * This is RegEx which is needed to be used if we want to catch something like:
    <tr data-url="/beach"
      {% if weather.isHot() %}
        class="clickableRow"
      {% endif %}
    >

 * Important notes:
 *  - We need \s* for catching all the whitespace before and after.
 *  - You can't make this for multiple attributes! In case you have multiple
 *    attributes, you need to make multiple if's too.
 *  - This is only RegEx for if-else. For blocks, swig values inside HTML 
 *    elements, RegExs are not needed.
 *  - Multiple if's can be only separated by whitespace.
 */


var open = /\s*\{%\s*if\s.+?%\}\s*/;
var close = /\s*\{%\s*endif\s*%\}\s*/;

module.exports = function(grunt) {

  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),

    htmlmin: {
      dev: {
        options: {
          removeComments: true,
          collapseWhitespace: true,
          customAttrSurround: [[open, close]]
        },
        files: [{
          // define your files here
        }]
      }
    }
  });

  grunt.loadNpmTasks('grunt-contrib-htmlmin');

  grunt.registerTask('default', ['htmlmin']);
};