code: function findMetaTag(attribute, regExp = /.*/) {
    let metas = document.querySelectorAll(`meta[${attribute}]`);
    for (let i = 0; i < metas.length; i++) {
      let match = metas[i].getAttribute(attribute).match(regExp);
      if (match) {
        return metas[i];
      }
    }
    return null;
  }
docs: Finds a meta tag by searching through a certain meta attribute.
  
  @param  {String} attribute
  @param  {RegExp} regExp
  @return {Element}