Grunt string-replace CSS url to rails asset

string-replace-css-url

// string-replace in two passes, because of bug?, reason is apparently related to lodash template security
// find:  ": url(img/imagename)"
//replace: "url(<%= asset_path 'img/imagename' %>)"

'string-replace': {
  inline: {
    files: {
      'dist/css/app.css.erb': ['css/app.css'],
    },
    options: {
      replacements: [{
        pattern: /:(\s*)url\((img)(.+?)\)/ig,
        replacement: ':$1url(\<%= asset_path \'$2$3\' CLOSETAG)'
      },
      {
        pattern: /CLOSETAG/g,
        replacement: '%>'
      }]
    }
  }
}