["html",
  ["p",
    "Even more complex urls like ",
    ["a",
      { "href" : "https://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29" },
      "https://en.wikipedia.org/wiki/Block_cipher_modes_of_operation#Electronic_codebook_.28ECB.29"
    ],
    " should be matched"
  ]
]