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   1  /**
   2  * @param {!Tag}   tag
   3  * @param {string} innerText
   4  */
   5  function filterTag(tag, innerText)
   6  {
   7      var slug = innerText.toLowerCase();
   8      slug = slug.replace(/[^a-z0-9]+/g, '-');
   9      slug = slug.replace(/^-/, '').replace(/-$/, '');
  10      if (slug !== '')
  11      {
  12          tag.setAttribute('slug', slug);
  13      }
  14  }