[format-spec]: https://docs.python.org/3/library/string.html#formatspec
[grapheme-boundaries]: http://www.unicode.org/reports/tr29/#Grapheme_Cluster_Boundary_Rules
[mkdocs]: https://github.com/mkdocs/mkdocs
[mkdocs-material]: https://github.com/squidfunk/mkdocs-material
[perl-uniprops]: https://perldoc.perl.org/perluniprops.html
[pymdown-extensions]: https://github.com/facelessuser/pymdown-extensions
[re]: https://docs.python.org/3/library/re.html
[regex]: https://pypi.python.org/pypi/regex
[tox]: https://pypi.python.org/pypi/tox
[unicode-posix]: https://unicode.org/reports/tr18/#Compatibility_Properties
