gistfile1.txt

    if (keys.length) {
      const re = new RegExp(keys.join('|'), 'g')
      const newContent = []
      const keysInText = content.match(re)

      content
        .split(re)
        .forEach((substr, i, arr) => {
          newContent.push(substr)
          if (i < arr.length - 1) newContent.push(<strong>{keysInText[i]}</strong>)
        })
      content = newContent
    }