linkify
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url http://www.youtube.com/watch?v=5Jt5GEr4AYg.
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<p>url <a href="http://www.youtube.com/watch?v=5Jt5GEr4AYg">http://www.youtube.com/watch?v=5Jt5GEr4AYg</a>.</p>
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don't touch text in links
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[https://example.com](https://example.com)
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<p><a href="https://example.com">https://example.com</a></p>
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don't touch text in autolinks
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<https://example.com>
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<p><a href="https://example.com">https://example.com</a></p>
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don't touch text in html <a> tags
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<a href="https://example.com">https://example.com</a>
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<p><a href="https://example.com">https://example.com</a></p>
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