linkify
.
url http://www.youtube.com/watch?v=5Jt5GEr4AYg.
.
<p>url <a href="http://www.youtube.com/watch?v=5Jt5GEr4AYg">http://www.youtube.com/watch?v=5Jt5GEr4AYg</a>.</p>
.


don't touch text in links
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[https://example.com](https://example.com)
.
<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>
.


don't touch text in html <a> tags
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<a href="https://example.com">https://example.com</a>
.
<p><a href="https://example.com">https://example.com</a></p>
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match links without protocol
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www.example.org
.
<p><a href="http://www.example.org">www.example.org</a></p>
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properly cut domain end
.
www.example.org版权所有
.
<p><a href="http://www.example.org">www.example.org</a>版权所有</p>
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emails
.
test@example.com

mailto:test@example.com
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<p><a href="mailto:test@example.com">test@example.com</a></p>
<p><a href="mailto:test@example.com">mailto:test@example.com</a></p>
.